+1 - Nothing like being able to show a client who's got a billion dollar idea that his site can handle 10M users for $15/mo.
Just remember to explain all the caveats that are being discussed here. We're nothing without out integrity. Your client won't be listening to that point though, he'll only be excited he's going to be a billionaire for $15/mo.
Well if they are going to be getting that amount of traffic either they have a very poor conversion rate/profit margin or they could just afford a proper dedicated server or two.
Just remember to explain all the caveats that are being discussed here. We're nothing without out integrity. Your client won't be listening to that point though, he'll only be excited he's going to be a billionaire for $15/mo.