I think the figures you are quoting are far too much.
Our experience was that if the weather is too duff for flying, the students cancel their lessons early and do something else. They don't come to the club unless they are going to fly and would prefer to hold on to their cash for the next flight. They would not be keen on paying out much (or any) money for a simulator.
The company we were approached by wanted us to spend big bucks on a purchase or a rental arrangement but we couldn't make the income from occasional use work.