I just checked the proposed CO budget for 2017 and it’s $28.5 Billion. So if 2017 marijuana fees and taxes is around $200,000 million, it constitutes a contribution of .007% to the state budget and an unknown exchange in healthcare/crime/social/educational costs.
None of which has anything to do with your claim that:
“They’ll just buy it on the black market for cheap. In the meantime, Marijuana legalization will provide cover for black market sales.”
The numbers refute that contention.