We did a compilation of research on how much we spent since starting Tampa Devs (the vast majority of costs are on startup costs, hackathon, and merchandise) and presented it at our first event of the year in February You can check out our presentation which has some of the slides available which goes into more detail https://docs.google.com/presentation/d/1pX_ZFtPDeRsj0E3r4Q32mhokmhcEE80agW6XHmWqHk0/edit?usp=sharing