My reading of your post is that you knew he was a scumbag before he got in. The fact he produced £70 enabled him to get in. You then went on a journey and established that he was a drug dealing scumbag who'd just been released from the nick that morning and yet you decided to hang around and earn another tenner.

If I've misread your post I stand to be corrected but my principles are pretty straightforward when it comes to drug dealers.