This.^^^^ Just click the occasional drop you get, and check the bazaar to see if you can find something cheap. Other than that, there's no point in worrying about it...just save up the collectible dispensers from Overseer and click them all when the next expansion drops. That's what I did on 2 of my accounts. Around September-ish, I started hoarding them on those accounts, and the day CoV launched, I finished off ToV collects. It's nice to get a new big bag, a trophy, and a bunch of AA on launch day.
If the time involved to do collections isn't worth it to you then don't do it. Or work on it over the next twelve months. We aren't even three weeks in.