How popular was the project in reality? How many visitors?
you cant count the investor the interest for this project is the most important this is to run to launch this project the most variable thing to make the posible the imposible..
If you want to more about arena space you can visit their website and I think all your question will be answered there, as I remembered many visitors are satisfied of using the VR park in their country built. They already ongoing on BIG Amusement park in MOSCOW for the opening of ICO and will be in march I think so just what I read/see in their roadmap.
I think, 52,000 people just visited the park in Moscow. But better to check their website for more updates regarding the arena and how well the park is working. And also you can join their telegram channel for most updated news about Arena Space and there are more active developers or part of the team present in their telegram.