I've only ever bought two DVDs, no blu-rays ('cause I can't play them), but I've got 50~ anime scale/action figures so I can relate to you on that. Though the big difference is that I don't have disposable income, quite the contrary as a matter of fact.
Depends on which season you skipped, but Steins;Gate and maybe Nichijou and Tiger & Bunny seem like the only shows that would be good enough to own or buy merch of.