Wheel does give you a chance to get more than 1 key at a time, but it's very slim. I would buy from cave directly and on your free spins get keys. I just used coupons to get 40 keys so I could get the rebate and I only got 3 level 3 runes and the rest were level 2 and 1, but it still raised my bp by almost 300 which is pretty imo.