[sanswork]

First two ideas that spring to mind would be a realtime video encoding service and a CI service. In both cases your users to server ratio would be very low and in the first case your data costs would be very high. So you might be only making profit of $X per server per month even if your revenue is $XXX per server. When you're running your own servers you need a big investment up front but lower operational costs which is where the funding would come in.