What are your views regarding server resources abuse? Do you think that this clause is enforced correctly by (most) hosts? Do you think that hosts rutinely abuse this clause?
I've yet to have to enforce any abuse clauses in my AUP. I do have a strict AUP and wonder if it does frighten some potential customers off. But I also believe that if they are that worried about it I probably don't want them as customers anyways.
I've had a potential client ask me about it and was worried about his sale's people's mailing list being seen as spam. After some conversation with him we determined that it wouldn't be spam and he then ordered 2 managed servers. We've had no problems with any abuse at all.
I also verify my orders with my customers as well. I think doing this and the strict AUP helps reduce fraud and abuse. I also take the personal approach with my customers. I put out a monthly newsletter, I send them each a welcome email personally (not a form email) and ask them how things are. Again, I think this can help reduce abuse. They know who I am and I know who they are and they aren't afraid to email me before they do something that could be classified as abuse to get my opinion/approval.