To explain: I have 117 minipets, all of which are game-only (ie. none from trading cards or collector's editions), which means I am well over quota for the 75 pet Achievement. All of the BoE ones were bought with gold over the years.
I have a bike.
I have ICC-level BoE gear.
What I don't have: the 100 mount Achievement (I have 97 right now), because I can't buy any more with gold - the only places I can get a mount now are rare drops or force myself to do the Argent Tournament dailies.
Since I shirk at anything that includes some sort of "farming" (herbing, grinding mobs, running dungeons, daily quests etc) because I get bored easily, I'm rather disappointed that I've run out of things I can buy.
In fact, the only thing left on the Auction House that I could possibly spend my gold on is a Battered Hilt... and only for the quest chain, because the weapon itself would be a downgrade.
Oh well... maybe it's about time I started saving anyway, since there's bound to be plenty of BoE stuff in Cataclysm. Hopefully more mounts.
And no, you can't have any gold. :P