I assume he believed that RG could and would do renovations to the house and barn that would make up for the income lost due to the deeply discounted board / rent deal. Like so many who have been conned by grifters, MB was probably naive and wanted to believe that LK and RG were good, honest people who would hold up their end of the deal.
We’ve all seen the photos of the house in disrepair. We all heard RG testify that he was doing the bare minimum of work at best, and often less than that. At some point there had to have been a discussion about stepping up the work or increasing the board costs. Perhaps that the new paperwork LK had a meltdown about being asked to sign.
Imagine MB’s surprise when LK / RG informed him they also expected to be paid $50k? And is that when LK began her “war” (her words) against him, terrorizing and harassing everyone at the farm? No wonder he wanted to do a background check and find others who had been scammed or hurt by this pair. No wonder he wanted to report her to SadeSport, to prevent anyone else from joining her list of victims.