we are buying server hardware to maintain the security, robustness and performance of geekhack.org.
we don't divulge exactly what we are buying or what we are running on it for security reasons (we have been thoroughly owned before, and don't wish to repeat that saga)
frankly, the money we have collected is pretty piddly. to date (prior to geekhack pack revenue), we had collected 1650$ from the beginning of time (or when geekhack started taking donations, whichever came first

. frankly, staff have already donated 2x directly in hardware than 1650$ can buy.
i will say this. we have an unusual hosting platform, we require a high degree of redundancy, but our monthly costs are much lower than your average site. for reference, a site of our size and traffic typically costs 500-1000$
per month to run in bandwidth and hosting fees.