There are two sides to every transaction, the buyer and the seller, i.e. demand and supply. If cannabis gets legalized the supply will increase, demand will probably increase as well but not as much as supply. Regular consumers will grow their own if they have a bit of backyard to spare. Price will decline. There probably will still be a "gourmet market" where a few fools will pay $20 per gram just for the bragging rights, but your average cannabis user is going to buy good quality weed (it is a weed, you know) for a lot less. The government seems intent on supporting the black market, witness Washington state, so, as always, prohibition will distort the market. The government's meddling is really your only hope, Buck. If cannabis were truly legalized, similar to tomatoes, you would need to find a job.
Any dufus can grow enough weed in their backyard to satisfy their own cannabis desires, even you, Buck. You claiming that your magical marijuana will sell itself and you will be able to make a handsome living by producing 30 pounds of weed every year just gets my funny bone. Besides that, I could swear you claimed that you just covered costs in your cannabis enterprise; all just for charity and so on...