It’s really up to you if you want or do not want a website.
In your case, this all sounds like some fun project that you’ll play with until you get bored or move on. However, if you suddenly “blow up” in this, and are getting booked for good-paying shows and/or you’re selling your tunes online, then the owners of the copyrighted materials you use will take notice. Right now they don’t because you’re not threatening their profits.
My pushes on DJs having “official websites” is more when they really want to get serious about marketing themselves. When you see a DJ seeking bigger gigs and more money. Social Media alone won’t cut it, as your “official site” should be the “Rome” that all your roads (Social Media) leads to. However, if you see no need right now and aren’t going beyond fun and smaller gigs, then don’t worry about it.
Currently, my own site (http://www.d-jam.com) is mainly for me to show as a portfolio piece to potential web design clients and employers. You can see there’s not much there other than mixes and two mashups I “recreated”. I too would probably have no need for an “official site” had I not worked in web design/development.
I only push a site when one wants to get serious about their marketing and especially in building their brand.
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