"You are making an unsubstantiated assumption that the cost of complying with regulations is higher than the overhead of costs that come with running an illegal drug manufacturing/selling operation."

The proof is the cost of legal weed, which is sometimes double the cost of the black market prices, due to regulations and taxes.

"Also, your point was proven factually wrong, as pot is way cheaper in legal states and is way safer, thanks to regulations."

Safer? Maybe. Cheaper? Hardly. You have provided zero proof and your arguments just don't make a lot of sense.