Actually, I think it's a great idea!
As long as the cost is high enough (100 electrum maybe?), I think it would be a very nice way to promote diversifying your FG farming decks.
To clarify, paid uses of the oracle after the first per day ONLY provide FG info; no nymph chance, critter, money, card, etc.
You would want to make the cost so high that it will only make your FG farming slightly more efficient if you do it well.
The main point is that FG farming will be much more FUN!
Wouldn't you love to use your knowledge, and to have a deck built specifically to kick that )&@$ing dark matter's @$$?!