Not paying for something is not the same as not being able to participate in it. In this game, you can literally buy the event currency by using nutaku gold. As far as I remember for the very first butterfly event, only the top ranking players received the rewards, meaning limited amount rewards and anyone who isn't paying pretty much having no chance at all at receiving the reward girl. I quit way before the xmas event so I wouldn't know if it was any different.
So sure anyone can participate, but only paying players will manage to stay on top in the end since the amount of currency one would get via paying far outnumbers anything you can gather from the game itself.
Last edited by Aidoru; 01-18-2017 at 09:58 PM.
Let me reformulate then : The only event I couldn't COMPLETE without paying something was the real last...