@Riot: What are your thoughts on a "bonus gold -> bonus damage" passive?

One of my Champion Concepts uses the following two passives:

P - Pickpocket

Whenever Ritz hits an enemy Champion, large monster, or turret with an attack or ability, she gains 5 gold. This effect has a 10/9/8 second cooldown (improves at levels 7 and 13, respectively) (not affected by CDR).

Additionally, when Ritz gains a kill/assist, she gains 15 bonus gold.

R - The Big Heist

Passive: Ritz's basic attacks deal 10/20/30 (+0.1 AP) bonus physical damage, plus 10% of the gold she has farmed from Pickpocket. (This does not add to Ritz's attack damage.)

Basically, it's kinda like Nasus and Veigar in terms of hyper-carry potential, but relies on Ritz taking risks by either poking the enemy (she could get rushed down) or jungle farming (and thus not helping her team out).

Does this seem like a good idea or bad idea?