To add to Patrick's experience: You will find these people at the cheap end of just about everything, not only SaaS. For example, our ad department finds that the people who purchase smaller ads are vastly more likely to cause trouble (e.g. "The ad is nice, but could you make it pop?" "OK, it pops more, but I would like a photo of my pet parakeet in the corner." "Can you move the parakeet up half an inch?" "Find clip art of another parakeet so he has a friend." "I want a discount on my $35 ad because I don't think the parakeet clip art you found is cute enough." vs. "OK, corporate approved it, let's run with it").