My 100 was just an example, I envisage it being more than that.But your suggestion was sell 100 to away fans (higher associated cost), rather than 500 or so home fans.
I want the club to prosper too and in the scenario you provided, there would be a negative affect.
Derby on Saturday may be different, as they would be likely to sell the top tier, but we may come close yet too.
There were no where near 500 Blades fans in the upper tier on Saturday, they should be housed elsewhere then to save opening up the upper tier, that would save us money, even if we aren't going to give them to the away fans.
I admit that I might not have put my point across very well before but hopefully you can see what I mean now.