There are two Neo Geo systems, the MVS which is the arcade and the AES which is the home, the two carts are slightly different so that it is not possible to plug them into either system, however the chips are the same so people are able to swap the chips from an MVS arcade card into an AES cart. The thing is that MVS carts are cheaper than their AES counterparts. So basically this is an MVS arcade cart converted into an AES cart, which should be mean that theoretically it should be cheaper as it is unofficial version of the game.
*EDITED*
Sorry ami_junki, I had to remove the last sentence of your post as it could be considered price driving.