Hi there, Dave. It's just coincidental that the amount received happens to click over to zero after reaching the goal.
This is about how it happens, every month:
The amount we need for the site & app is $255. Typically, at the beginning of the month a few people donate... and then nothing happens again til the end. The very last day people will usually throw down the last few bucks to make the goal amount and then the counter resets after that because it's the end of the month.
Or, the goal isn't met and the counter rests anyway because we've pulled the money out of pocket. Either way, it resets for a new month.
Trust me, this is not a commercial money making scheme. There is no advertising on SF. How would we be making money here aside donations? You can look at the amount as the end of the month draws near and see how long it takes to switch over to reaching the goal. (and you can see that the money is added automatically without human intervention when you have made your own donation. You put in $10 and then reload the page and it's there - along with your Supporter banner - automatically even if no staff or anything are on so it's creating that on it's own)
SF could be making a load of cash with advertising. We have been offered it in the past by various companies. It's kind of impolite to have to e-beg for the rest of the money by months end but it also sucks to have to pull it out of our own pockets every month too (and by "we" I'm talking about like 2 or 3 of us here). We do what we have to in order to make the place run. We do it because we love the place. We do it because we care that you have a place to come to every day.
Matt