I edited my post since I meant to say "guarantee he didn't" and missed the n't. I'm amazed how often I do that.
But I suspect you knew I was saying what I meant. I remember discussion that Chad at one point had an actual office job in Idaho Falls, but had quit it because the money from the writing and publishing had become enough. Maybe at one time he was, but not now. Chad and those who wrote for his publishing company are not bringing in anything close to this, IMO.
I say my opinion because I may be missing something and I have to go based on the information I can get at, but here's a few facts to make my case. Okay, maybe a long screed to make my case.
The book that has been said has been doing very well for Chad, "One Foot in the Grave," about his experience as a cemetery sexton, is currently ranked at about 108,000 in the Kindle store on Amazon. He has 10 books available in the Kindle format. None that I looked at are ranked better than that with all that I checked being somewhere between this one and a rank of 500,000-ish. Kindle books priced at $2.99 with a ranking in the 100,000 - 500,000 range make a profit, if self-published (so not splitting profits between the author and publisher since the author is doing both of these functions, which kind of applies to Chad's books here) is going to be $30-50 a month. Chad's Kindle books actually are priced from a low of $3.49 and 3.99 for "One Foot in the Grave" and "An Errand for Emma" which are currently his highest selling and most recently released books to $7.99 and $9.99 for his others, so they'll make more. But best case would be going 3x the high of that range for all the books, a definite overestimation which gives us a total income from Kindle books on Amazon of $150 x 10 or $1,500 a month.
The vast majority of Chad's books and those published by his publishing company aren't going to be available at the local bookstore (either Barnes & Noble or something locally owned) but no doubt can be ordered by them if you request. Or you can order them on Amazon. I'm not sure what the sales ranks of paper books on Amazon means in terms of volume, but can say that at least on Amazon, Chad's books appear to be doing worse there than in the Kindle format. The finances are also vastly different because of the cost of printing the books, getting them to the physicial bookstore, storage in between those to things, plus returns (stores can in most instances return unsold books to publishers for full credit if they don't sell). With two exceptions that I'll get into in the next paragraph, I would be amazed if Chad could be making as much on his paper books as he is on the Kindle books. But just to err on the side of giving him more credit than he probably deserves I'll take my significantly inflated $1,500 a month income from Kindle books and assume he gets the same for paper books sold via Amazon and other outlets that are outside of the big exception in my next paragraph.
The two exceptions are the Deseret Book chain and the Seagull Book chain, two chains with locations largely in Utah and southern Idaho, maybe a few slightly outside of that, plus an online presence. At least one of them, Deseret Book has ebook purchase options as well as paper from their website. These two stores are aimed at the Mormon market and the possibility exists that Chad and the publishing company sold a ton of books through these chains. I seriously doubt it was $30,000 a month worth between his and whatever portion he got for the books published for other authors under the Spring Creek Publishing banner. The Mormon market is a niche, and a decent sized niche, but I don't get the impression that Chad or any of his authors except maybe JR, when she was with him, were best sellers by any stretch. It doesn't appear (based on looking at her books on Amazon) that JR has any books currently available through Chad's publishing company. (A few I looked at published by other publishers were in the top 10,000 sales ranks at Amazon which while not oodles of money are still the next level from Chad's.) HOWEVER, the big issue here is that apparently Seagull and Deseret have dropped all of Chad's publishing company's books, at least from their websites. I remember reading early on that they had dropped JR's books when she got in trouble, but I just checked both sites for any book by Chad, JR, or HS (another of Chad's bigger name authors) and found nothing. I seriously doubt he was making 10x the money from these small niche chains than from Amazon, but if he was that money has been shut off now.
Obviously lots of MOO here, but at least a few facts and measurements that you can use to come to your own conclusions. I know a lot of authors, some of them who have had books make various high profile "best seller lists" such as the NYT and USA Today lists. Many people assume authors are rich. Some are, but those who are (Stephen King, Grisham, Patterson, etc) are the exceptions, literally the top 1-2% of authors and have made the mainstream bestseller lists consistently for many years and many books. Making decent money the way Chad is approaching it by being his own publisher means it takes selling less books, but not as many less as he's selling.