So I had this Level 81 Mage, and I had perks to spare, so I decided to take investor just something to blow away my money it was that or get the perks for misdirection and make people walk around in their underpants. Though as of yet that isn't off the table. But what should I discover right after investing with Taarie she became available for marriage.

Yeah, just don't pickpocket your investment back; the merchant won't have the extra $$$ and you can't re-invest.