I didn't get the vibe that people really got the scope of this $6 mystery box deal.
I'm a member of their subscription service and I get a 2 album mystery box per month. Almost always it contains 1 hipHop/RNB album, and usually one UO exclusive color vinyl of various genres- whatever UO typically carries.
I'd say that even if I don't always keep them, the Discogs average for every album I get is between $15-25. My last box from them was A Tribe Called Quest- Hits/Rarities, and the She & Him Tribute To Brian Wilson on blue vinyl. So it's not no name, garbage filler in these. At $3 a record, I'm certain anything I don't want can go in a well stocked $5 bin at the record show, and virtually any local will give you $3-4 trade on new LP's.
anyway i ordered 30 of these