Yeah, plenty. I'm one of them. I'm only a spectator but from the outside looking in, Penryn really do their best to facilitate the Cornwall games.
It is good to be able to watch some decent level League down here - I only ever watched SL on Sky Sports, beginning in the late 1990s on Friday nights so it was a bit distant if that makes sense.
Another factor is that Penryn are blessed with plenty of space for parking and the signposting is pretty good around the ground.
The thing I notice is threefold:
1) People who have moved to Cornwall from elsewhere who can now watch live RL on their doorstep.
2) Locals who want to watch sport (including those who have been longtime RL fans)
3) Away fans or fans on holiday who want to watch the game.
The good thing about it is that it fits in well with the Union season winding down from April, so you can watch the Pirates (RU) in the winter and we get to watch RL in the summer. It's a win/win with no league football to speak of.