Mmmmmmm, not sure where you get that figure from? Just checked and eighteen months ago they had 26,000 season ticket holders, can't imagine for one minute they have added 16,000+ since then! You only have to see the amount of i pads taking pictures during a game there and the ridiculous amount of half/half scarves that they attract a substantial amount of tourists at their games probably from their links with Thomas Cook(?).
As for walk ups at Goodison, they are virtually non existent these days, it's largely sold out well in advance!