Organizing a big festival is always a huge headache, and you really have to take your hat off to anyone with the nerve to do it. They often end up making a significant financial contribution too, because the setting up of a temporary grid costs rl money.
For as little as three bucks you can get kudos and publicity, and brownie points with the higher power, so why not consider helping out? OK I may be lying about the higher power, let's call it the HG power.
There are lots of levels at which you can contribute, and each one brings a bigger slice of land, publicity and warm glowy feeling, although the last might just be the wine, so don't quote me on that.
Here are some stories from people who chose to go ahead and put their hand in their pocket for OpensimFest. How hard is it to sponsor? why did they want to do it? What do they hope to see at the event?