I can only go from my experience and I don't know what pass you have but I got a silver pass for Busch Gardens Tampa and Sea World Orlando in like 2001.I got it using EZ Pay and in 2003 I went to visit Busch in
Virginia and upgraded my pass to a Platinum for like $1 more a month,the requirement was to pay it for two years being a Platinum pass,the two years passed and I've been paying it ever since at 2003 rates,so they basically got me for life as I'll never stop paying it with such a good deal,since the two years requirement expired in 2005 I could have called and cancelled it any time since then but that's not going to happen.