As a collector with a fixed speed turntable (33 & 45 rpm only), there's nothing worse than playing a record that you've heard pitched up, or down, after you've finally tracked it down, only to find it sounds too fast or too slow at home on your own turntable.
I suppose by admiting that I have gone out, tracked down, and purchased a record on the basis that I liked it at the speed I heard it at but didn't know it had been pitched up or down, that the concept works, and in a way it does, BUT it does rather spoil things at home on your fixed speed turntable, don't you think?
Funnily enough though, having said all that, I heard 'Cleopatra' at a venue a few years ago, unbeknown to me at the time it was slowed right down to 33rpm I think, then picked up a copy about a year or so ago, only to find I actually liked it better at the correct speed. So, I guess it's all down to individual taste and the kind of hardware you've got at home. If you're not a collector and simply enjoy your nights out dancing, then I guess there's nothing wrong with pitching.
Hope that all made sense?