you can sell advertising or you can raise capital - if you are growing that quickly you should have no problem raising capital. Charging people is one way to drastically halt your growth, though - if that is what you are after
"... if you are growing that quickly you should have no problem raising capital. Charging people is one way to drastically halt your growth, though - if that is what you are after ..."
Good point.
Do you think it would it deter users if they wanted extra features? Casual users might want to stick with zero cost but I wonder if business users might be willing to be charged for extra features that free users cannot use?