Gave mine up when they put seats in the Kop because I didn't think it'd ever be the same - got that part right. Where I went wrong was that you could just go into the shop and buy a season ticket - no waiting list at all.
After realising it wasn't as good, but still okay I put myself on the waiting list and now 2,818.
Apart from going the 1990 semi against Palace, it's my biggest regret.