Unless you go to away games and buy lots of Adidas stuff, membership now has no point to it at all, at least before if you booked for multiple games or multiple people at once you only paid a pound once and saved a quid on the other tickets.
Now you pay 30 quid for membership, save £1 a ticket, spend £1 booking fee per ticket, so save nothing. After 5 games, if you can find a category B one, you can get it free, making back up to £27 (the worst matches of the season costing that much is a joke in itself) if you're an adult on the South Stand, but a ticket of far less value if you've got a concession on the Kop.
Membership used to give you a couple of quid off tickets, cost less to begin with and gave you money off everything in the shop, now the convenience of the card compared to tickets through the post is about the only incentive beyond access to away games.