That seems a little rude. I'm with you that $75 tickets are steep, and hacker unfriendly, but it seems like 2 competing hackathons are going to spread our city's finite dev talent really thin. I can't see how this leads to a better experience for SW or your event.
Wouldn't it be better to have spread these events out? If people think SW is too expensive, they'll wait. If they want to contribute to both, shouldn't they have the option?