The money on Kenny was amateurs staging the crime scene to make it look like Kenny owed a drug debt. DeWine/Reader made it clear that the suspects tampered with the crime scenes.
It was a year before the Wagners moved. If Chris Sr. and Billy were doing business together it obviously soured and stopped, considering Billy plotted for 4 months to get rid of Chris.
Their business dealings would likely have been off the record, the Wagners filed for bankruptcy in 2001 or 2002 and only had $500 plus in social security coming in. Fred paid Billy under the table it appears. Angie took customer's phone calls for Fred and probably was also paid under the table.
Their assets were listed at about $2,500, and their liabilities at about $10,000, including almost $2,500 owed to Sears for clothing, $500 in medical bills and $325 in unpaid utility bills.
Their only monthly income listed was $530 in Social Security payments and $389 in food stamps.