Best answer by Dubstep.fm
when i visit http://soundcloud.com/you/sets it shows the proper track counts. when i browse to a specific playlist, it shows the correct count
once the page has completely loaded i can see the track count change from 425 to 200
and i scroll down and only 200 show
then i refresh the page, and let it load again.. this time, no track count at the top
yet when i scroll down, it loads the proper number of tracks
*shrug* so maybe there is a limit, but was implemented at some point after i had created them.