I play my games at home the same way I did in the arcades.
If I am having a great game, close to wizard or replay, I will buy in.
Certain games were designed with this feature as they have tough to reach wizard modes (TFTC, WWF, Roadshow...)
Good luck reaching Crypt Jam without a buy in or crossing coast to coast with Red and Ted.
Other games are just cash grab buy ins (Demo Man, Judge Dredd...)
When I had my DM, I disabled the buy in because the game was just too damn easy (hence why I sold it).
On TFTC and WWF the buy-in are a welcome addition.