Last year Michigan received about 290 million in weed taxes, around 90 went to municipalities and county governments, 100 million to schools, and 100 million to roads.
What are the prices in Michigan? One of the complaints in Colorado is that the prices (for those without red cards, anyway) were set so high that some people were still resorting to the black market.
Michigan is dirt cheap. $80 ounces are pretty common. $40 for an ounce of shake if you avoid border towns like Monroe. Even the Monroe dispensaries are cheaper than the Ohio ones that just opened, so everyone in NW Ohio still travels north for it since they dave moeny.
It was cheap and high quality in Colorado for the first few years, just long enough to kill off the black market. Now it's not as strong and has doubled in price. I only do edibles so I can't speak to the plant quality but the THC content per serving gets lower every year it seems.