Reply to Top Dj's using mp3's or what?

Hey,

This is something that has been puzzling me for a while and as I can't find any information online I thought I'd hear your thoughts on the issue.

I really like 'Hardwells Tomorrowland 2012' performance, especially how he incorporated remixes of more 'popular' chart music. My concern is, when I try to find the tracks, there free to download 'niche' less popular songs on SoundCloud etc which people have remixed, of which are only available to download in mp3 format (320 kpbs). There not available on BeatPort or any form of music selling website.

Now, as a DJ, I hear endless times to mix with ONLY .wav formats apposed to compressed mp3's which of course, .wav is uncompressed and 'better'. And that got me believeing, how is Hardwell (and no doubt many other top 100 dj's) using mp3's and getting away with it at HUGE venues with surly massively expensive and high end speakers?

I'm pretty sure there not finding a wav version (quote me if I'm wrong) as I can't find one and also many 'remixes' of popular chart music, use mp3 versions of the original song to start with.

It's annoying me because I'm finding great mixes that I want to use in set's but then are held back by mp3 only versions. Especially as I buy all my music as wav (same price for me as mp3)

Would love to hear your thoughts on the issue.

Thanks