I can only go by what I have heard but it does seem like some of those bandcamp bands really do like to support their fans. I don't know how you find the good ones that offer you freebies from the thousands that are out there but it seems that they are out there.
Allegiance were around about 7 years from 1990 they had 3 EP's, 2 albums (1 is as rare as rocking horse shit) and 1 live CD. There is also a VHS I believe they only sold through the fan club. They have reunited 3 times in the very early 2000's but not since.
Talking about bands not suited to each other. Allegiance were thrash bordering on death they toured with Slayer, Kreator and Fight to name a few, Rob Halford's management group managed them for overseas dealings and when they reunited in 2004 it was to support KISS