I think @Jay Hurst nailed it on the head.

Can I just deny him on the sex offender account alone?

I had this happen earlier this year since I was not on the agreement, but found the buyer the deal through a wholesaler.

You have to ask lots of questions and make sure you have some level of understanding about cost segregation and not relying 100% on someone else, even though that is what you are paying them for.   

This is what causes people to not call ever and to have friends fix stuff the wrong way.If they want something checked out and then it turns out to be fine, maybe then a service call would be warranted, but not every time especially when they are service issues that are on you.$250 a call for someone is insane.

If you can get a handle on the cost to repair these issues and still think its a good deal, I would be inclined to move forward if I was the buyer.

Quote from @Chris Doakes: So do you have a recommendation on another PM in the area? 

Will you check on a property I'm currently doing construction on.

Based on your inspection findings, these issues could potentially be costly and complex to address.

They have nothing to stand on at all.