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Personally, as reader, I mostly go for a MMP book over a Trade Paperback because it means I can afford more books, and I'm more willing to take a risk if it's a new-to-me author. Alas, I seem fated to have my work in the more expensive TP, at least for the time being. Erotic titles are traditionally printed in TP, and because I was an early author at Juno Books my fantasy work there also came out in TP, although the line went over to MMP afterward. :-( I'd love to see something of mine in mass-market paperback one day. I guess I’ll have to add it to my "to do/dreamer" list ;-)
Anyway, if you're a reader in the US and you haven't yet given DOUBLE DARE a go, now's your chance to get it at a great price! :-)