I have a lot of Heroclix too, but I plan on selling off all my Marvel stuff sometime. I'll probably never play the game again (it's a little wonky, especially for me and my tendency to field fluffy teams over good ones), but I have too much invested in my legion of Batman foes to check out completely.Playing the minis in general sounds tedious to me, but then I got sold off of minis gaming due to the group I played with. It was Heroclix instead, so no need to put in the time to paint and make them look good, but there was still the pay to win angle that I didn't like. Probably doesn't help I don't really have a passion for minis gaming in general.
I really like 40k, but I think the suggested 2000 point game size is too big and arbitrary. 1000 or even 1250 point games are much more fun in my experience, and the smaller size tends to eliminate some of the cheesier units from being included.
I know people don't want to hear this, but AOS has grown into a more dynamic game than 40k. The turns are shorter (even when taking into account troop movement) and even the much-hated roll for turn initiative starts to make sense once you play enough. The only real problem I have with the game is that two armies (certain builds of ghouls and stripper elves) are cheesy right now and require little thought to win with.