“Begone, old stereotypes of sad sack singletons living alone and mourning their solo existence while covered in cats! New census data shows that there are a record number of singles in the U.S., and they’re spending a bunch of money all on their own. And they’re just fine with that single status, so stop asking what her sign is.” {From: A Record Number Of American Consumers Are Single, Don’t Really Feel The Need To Mingle – The Consumerist.}
I think it’s rude to hit on people while they are shopping (or at least it is when I do it), but it’s bigger than that: If you hit on single people who are trying to spend money, they may get creeped out and head for home early, with money still in their wallets/purses. Thus, we see how hitting on random strangers is RUINING THE ECONOMY.