We started trying to think of ways to spend money (or lose it) somehow. I had the idea of working your way up to a Master of Mercantile and simply investing in every store/trader before purchasing every player house in the game and furnishing them accordingly. Then not only do you invest in the store but then proceed to purchase all of that specific shop's stock and essentially amass an insanely large collection of weaponry, armour, clothing and the like. It would probably take a while to do but I might give it a go nonetheless.
Their idea was a little less heavy on the encumbrance. If they ever manage to get an amount of gold that large again, they're going to travel Cyrodiil, giving money to the rich and poor alike. In a word, bribing. Simple yet effective. Plus, everyone in the entire land would love you!
I'm going to have a search for some mods that maybe add expensive shops or other activities for me to spend my money, I always felt it was a shame to be able to earn your riches but never have anything to do with them.
Anyway, I just thought I'd post here and see what kind of things you all spent your fortunes (or pittances) on. :tes: