There is not enough demand for a stadium at the moment although there may be in 10 or so years time but that is a long way off. Yes we usually sell out pretty quickly but lets not forget that last summer Season Tickets were practically on general sale. Liverpool and Man U have thousands on their waiting lists and they have bigger stadiums than us. Every CL group game went on general sale this season too (although that may be due to the ridiculous price increases) and Swansea, Norwich, Wolves, Fulham (CC and league), Aston Villa have all had tickets go on general sale