Got a friend with a VG (same cover I think), and all he has ever done was clean it after every set. He has never resurfaced it, nor has he had the oil removed from it.
This is the second full league season he has bowled with it, and he bowls two leagues, so over 400 games on it, and he just told me last night that it seemed to be slowing down a little, so he's going to do an oil extraction/resurface before NEXT season, as he loves it and plans to continue using it.
Don't think I'd be afraid of THAT cover.