I agree with witty. If you think they'll give a return high enough to pay off the node and then some, it makes sense to get another.
The other way I'd do this is to build a buy wall with the proceeds to a certain level. Once you hit that level, instead of having to sell the tokens to get paid back, I would cash out the proceeds from the nodes and random airdrop Hive or HBD to all holders of the token, with no set expectation on what kinds of returns will happen or if returns will happen. If they want to take the Hive/HBD payout and put their own buy wall, so be it. And yes, I think 10% for servers and 10% for management sounds reasonable as long as the 10% for servers is able to cover the server costs in their entirety.