There are over 200 users who have an account for the bot, it is used quite frequently, this is in addition to the low faucet refresh times. I plan on taking measures to reduce the impact upon the next code update.
Nonetheless as far as I know, my bot awards the most Gridcoin out of any known public (non-researcher) faucet.
Yes, it's really cool! I was just ironic when asking why :-)
Unfortunately you are probably right that some measures may be necessary to reduce the ability to draw from the faucet, with high payouts and low refresh it may be next to impossible to keep things funded with the popularity growing as it is, although I hope you can keep it going and supporting the community