They definitely do have an incentive: attitude of consumers toward Larian Studios in the future, both relating to the company at large and any future EAs they want to release for player-testing.
I, for one, won't be participating in any more Larian EAs. This (lack of a) experience has soured me on Larian, whereas in Fall 2020 I was super excited to be part of the BG3 EA. Obviously I didn't expect my suggestions to be personally responded to, but I was expecting
some back and forth with the community at large.
In contrast, I will support Tactical Adventures in practically whatever game they release next, because I enjoyed and appreciated how they interacted with the community. They had a twitch stream where the developers answered chat questions!!!