...I could be wrong, as this is just a giant assumption on my part but. When I see mini-expansion/expansion. I think along the lines of World of WArcraft and it's expansions, or Diablo 3 and than Reaper of Souls.
For the amount of content those things add, I don't mind paying a bit extra, I may have to wait a couple weeks to save up the money (bills are a bitch.) But I will grab it. There is a difference in DLC, and Expansion, sadly many companies don't do DLCs well. I am hoping these guys do.
Also if you're truly against all things "DLC" which is additional content, you're also saying that expansions are bad. WoW not only has a subscription, but also routine expansions that cost way to much. They are still running. D3 had it's base game for 60 bucks or whatever, and an expansion (Which I think was 40 or so.) I personally don't enjoy WoW in any way, but I do enjoy D3, and I can say for the 100 dollars I spent on it, I've sank literally thousands of hours into over the years.