If you believe you're skilled at sports betting, enough to pick the single best game daily.. could you actually discipline yourself to bet just once per day for an entire season to prove your profitability?
Personally, I'd struggle. The urge for more action would get to me. Even starting with one game, a loss would leave me feeling unsatisfied, tempted to chase and recover immediately rather than wait for the next day.
Is the point profitability, or discipline to cut out gambling. If you are convinced that you might find winners by just picking one per day, why don't you test that with separate budget?
If you are doing well, you could even keep a blog about it where you share your pick, so you can even gloat with your skill (if you believe it's a skill).
If you indeed would pick winners (which i am skeptical of), you would both make money and gain following that would probably bring you referral link money as well.