Jitney is a discount broker that executes buy and sell orders, which is the same as all the other brokers. The share price is what their customers on whose behalf they trade are paying for any given transaction. I don't think they are playing in-house games for their own amusement, though I suppose they could have a trader with a house account.

Look them up: http://www.jitneytrade.com/en/home.asp