I'm not worried about the fact that they have events ... what I'm worried about is that the content is coming in at a slower pace than when DMM was doling it out for the JP gamers. Having additional content, more events, and adding things like "private residence with furniture" options only serve to generate more interest, and not just for whales, but hooking in the gamers and to continue supporting the game. If interest remains high, you can get new gamers, as well as more incentives for people to spend money (if they so choose)
Right now, with what they did to Kanpani Girls, which is arguably doing well in Japan, not so much here, I have little faith Nutaku will actually bother with the new additions. I think the people that run the company are doing so for a very limited time, say a few years, and hope some VC or another company pays millions to acquire them, and the original founders can retire in luxury.