puhleeze. If your startup is hot, shop the fuck out of it. VC's are lemmings; once they decide with their collective hive mind that you're the hizzy, it's basically impossible to piss them off enough to kill the deal.
OTOH, if you're not hot, they will use any lame excuse to walk, and you won't have anything to 'shop' in the first place, other than warm fuzzy talk at the end of an expensive lunch.