Why is there a cap of 50 questions per month in stackoverflow.com? I'm sure 70 is pretty reasonable if you ask me, but 50 questions a month is hardly 2 a day.
My proposal is to have a cap of 150 questions in 3 months, instead of 50 questions a month. You guys do know when sometimes we are cracking something way above our ability and we do need alot of help for that project. In this recommendation, its a win-win situation cause the total amount allowed is still 50 questions per month.
Well just my 2cents. Otherwise people would just create 1 more account to use just because once or twice a year they exceed the cap of 50 questions a month.
(You could inform the user that he can only ask 150 questions every 3 months whenever he exceeds 50 questions in a single month)