Not really crazy since there were the Sanrio Wonderland concerts that one time! However, it was select concerts that were free, and it really wasn't worth it because some were in worlds that you could enter for free. Vshojo girls like Ironmouse performed along with some JP artists, with tickets going around $25 and so on.
But the difference is Sanrio wasn't giving to charity (unless I missed something, I was caught up in buying tickets for Ironmouse, so I didn't see if the fine print mentioned any), while this is clearly stating it's for charity and for the artists. It all depends on what you see is more worthy at the end of the day!