Download illegally to check if it's good.
Buy said album in CD form.
If not, delete.
I do it, and I like it.
I find other ways to support the band (ie: merch, go to shows, promote)
^I've done it quite some times
But anyways, I agree with Ensi and Cliff Burton. E.g. I was really waiting for new Sonata Arctica's particularly after listening to the Flag In The Ground single, but just in case I downloaded the album before preordering it. I'm glad I did, I hate every single song besides Flag In The Ground, so I've bought the single and I'm done.
Downloading is legal here, uploading isn't.
Allthough I like Ensi's method I don't have that much real albums.

I was going to see them for the lulz, seeing as they are pretty much my first metal concert.
But they are opening for Dragonforcenot gonna be worth it.
But they are opening for Dragonforce