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My understanding is that the whole point of SaaS (software as a service) is that users pay you an ongoing fee for use of your software (i.e. a subscription). What you're doing is selling a product and will probably need a much more significant ongoing sales effort whereas with SaaS, past a certain point, you only need to sign up enough new subscribers to cover your churn. You mention 9 prior ideas with $0 MRR - this idea also has $0 MRR (monthly recurring revenue) as one time payments are not recurring. You need to decide what you want - to build a product you sell for a one-time fee, or to create a subscription based product.