If I remember correctly, if your suede starts to slick and get worn, if you can take a grill brush (the one with metal bristles) and lightly brush the suede to get roughed up again. I am 90% sure I've heard that somewhere.
I prefer suede seats. I have only found one smooth seated saddle I liked, but it did not belong to me. I like the sticky quality to it, like mentioned, but only because my mare will buck without warning when she's feeling fresh and has been known to just decide when we're running around outside that it's time we should head home and suddenly we've 180'd. I probably would have been launched during those if my butt wasn't about Velcro'd to the saddle. I have enough movement though to go with the motion of loping comfortably, although the friction does make my butt rather toasty after a bit.