People who are involved in illegal activities often have "jobs" as a cover so as to not come to the attention of the IRS or other federal authorities. Have a job or business, pay your taxes and keep your head down. In the meantime, they're dealing drugs and raking in the money.
So GG travels the world on hunts looking for the big ticket trophies. These are EXTREMELY expensive trips. I know several friends who have gone on them. Maybe....just a thought here that he could be involved in illegal trading in exotics? Big money in the exotic animal trade especially if you are hooked up with the "right" people.
He owns a fencing business in one state and a guiding service in another. He's taking in income from two individually owned business and dealing drugs as a third. Legal on two fronts with some major funds coming from the illegal side of his businesses.
Nice little gig he had going.