Well I will just say a few things on why I think it could be a cool game to offer.
First of all, yes, a player could have an edge in the game. But is that such a bad thing? 99.9999999% of sports bettors are losers. (ok, I may have exaggerated that a little bit but you get my point!
) Most people who bet on sports lose because they just can't overcome the vig. BUT a few out of a thousand or so, CAN. So offering a game that might be +EV for some but -EV for most isn't really a losing proposition for the house. In fact, the game could become wildly popular for this very reason.
Second of all, I speak only from experience of playing many many many many games but IMO, solitaire is actually not that easy to automate. There are many intricacies that you wouldn't expect from such a simple game (especially for the rule variant where you are allowed unlimited cycles through the pile). The number of different deck permutations 52! is a very large number. There are some color equivalencies though. But not always because sometimes the suits do matter.
IMO, it's all about finding an acceptable price point. The standard rate as I alluded in a previous post is $52/game and you win $5 per card to the foundation (so $260 for a completed game or $208 profit). The pricing could be adjusted for a higher vig for higher amount risked and vice versa. Fact is, that you can always find a price point where most people lose and only a few profit to protect your bottom line but at the same time generate handle from the people who see a game that you can potentially win money at!