Here’s my issue:
1) You can only use music you can find on Beatport. So you can’t use bootleg remixes and mashups you like, or drop some old school accapella on top of something that BP doesn’t have, etc. I know BP has a lot, but it’s still limiting.
2) I’ve heard you can sell these mixes. If they still kept that, I can imagine a flood of kids uploading mixes to sell will go there, no one will buy them, and then DJs will complain how they can’t get a break.
3) You’re dealing with all the free services out there. So anyone wanting mixes will not pay for what they can get for free…not unless you’re a bigger name.
Here’s the PLUS though…you can more easily get mixes from the big names you love. So like how I’ll shop for trance by listening to AvB and PvD sets…this might be a means to hear them more. Now imagine it’s a more obscure genre of music.