I took "cheap bastards" to be slangy forum chat rather than your definitive opinion of mankind (not that it's wrong!).
If the comic is finished and you are releasing a page at a time, it seems it couldn't hurt to offer the finished product for sale. But let's face it, it would have to be really compelling for a customer to shell out when they can wait for the pages to unfold for free, which is the format we're all used to anyway with webcomics. On the other hand, if you don't release pages for free no one will ever buy it sight unseen unless you're established with a huge fan base that knows and trusts your stuff. I think I'm just repeating everyone.