Have you looked at other businesses doing this? How do they do it?
This could be useful for booths at amusement parks, where they already have the physical hardware ("shoot the bullseye"). How would you get physical wheels to the businesses? If it's virtual, how would customers trust that it's not rigged?
Thinking as a customer, I probably wouldn't be interested in something that's pure luck. I'd be more interested in something that's skills-based. Like, if I were buying something that was $34, I might pay an extra $1 for a shot at the prize. So this could be a 'guess the president' trivia game or 'shoot the bullseye' instead of 'spin the wheel'. Actually, I'd probably pay an extra $1 for a shot at even a $50 prize as long as the challenge sounds fun. The prize also sounds more attainable at $50 than at $50k.
But I'm not a gambler :) Maybe this is more interesting to folks who buy lotto tickets?