first of all, it's not literally "boys will be boys" -- female sales people are the same. I don't think you were implying otherwise, but I want to be clear.
> I'm reminded of all the sales people that try to scam you
Yep, there are a lot of people like that and you need to get rid of them as soon as you realize you hired one. You experience them in the company too. Build your comp plan so that you pay out for the successful deals (to the degree that is within the salesperson's control -- it's not their fault if engineering does actually screw up.). Pay out more for long term customers (often companies pay less, figuring it's less work to renew, but this incents the sales person to sign a good deal and make sure the customer is happy).
I've seen all sorts of screwy attempts: contract contains development terms not signed off by engineering ("hey, the prospect already signed it, how can you refuse to sign it???). Don't book a deal until you have both a signed contract (by both sides) and a signed purchase order. I've seen plenty of sales people send in one or the other, or both but with a signature missing ("they guy went home but will be back in the morning") on the last day of the quarter in the hopes of hitting their target or getting into the escalation zone. Refuse to put up with that crap.
It's like having a child. Any pretty much any of the good sales folks, if you told them that they'd probably nod, say "yeah", and laugh. And then go earn more money than the CEO.