Yeah, but it's a step function. You can service, say, 100k users on a couple of servers. User # 100,101 means you have to buy a new server. Technically that use

Yeah, but it's a step function. You can service, say, 100k users on a couple of servers. User # 100,101 means you have to buy a new server. Technically that user costs more, but the next 99,999 cost 0. (Leaving out rules about depreciation, amortization etc - I'm just talking pure cash flow.)