People could sign up for a league cup scheme that guarentees a wembley ticket for non season ticket holders and then find we're away every round til the semi.. hardly fair is it. Would cost them what £30 for a guarenteed jump the queue for wembley? And even if there were home games i think your own post gives away why it wont work - your boss pays £700 ish for a season ticket, hardly uses it, but will go to wembley... well people could pay £100 max for 3 or 4 home games in the league cup - doesn't mean they have to actually turn up for the games though does it, and they could then for only £100 jump the queue.
But i'm a season ticket holder on the cup scheme with 10700 points, so i guess what do i know eh.