and to sum it all up your strategy makes you win 80% of your bets. would you share the strategy to someone for a price or not?
It depends... or maybe yes.

If selling my own strategy will not affect my winnings, then I guess there's nothing wrong in selling it, right? As long as there will be buyers who are willing to buy it. The only problem is how the buyers will think. They might think that the strategy will work 100% of the time even though you said that it will only works 80%.
With the 20% mistakes that they can make using your strategy, that might cause them a huge amount of money hence, calling your strategy a "fluke" or worse, they might call you a scammer.

Hmmm, I guess I will not sell it in the end.

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