Quoted from PinHollow:
I was kind of thinking the same thing. I mentioned that to the seller and that it was a little high. His response is that most single players aren't fun and if they are they'll cost a lot more. That can't be universally true, can it?
Single players can keep features between balls so tend to have a little more to them. Multiplayer EM's can't do that. There are a lot of great single players that are fun and not a lot of money.