For DTD I think I must be in the minority- quantity! I've never had 'bad' sex, so I'd much rather so-so often than amazing once in a blue moon. I get real cranky if I'm not getting laid
For other things it really depends. A lot of the time I find the cost of quality out of proportion to how much better it actually is. Like if it costs 10 times more it's very rarely 10 times better.