People aren't purchasing freedom, they're purchasing convenience. And this isn't a new product. Also, as prices fall in the legal retail trade, shouldn't we expect more competition with the black market?
Think of the "buying freedom" bump as the bump that happens when a new restaurant opens. A lot of people buying pot for the first time (or the first time in a long time) probably don't really care about pot that much. Not enough to break the law to buy it. It's just fun to try something new.
Replacing "Pot" with "Norwegian Cuisine" is maybe a useful exercise. I'm in the group that doesn't care much about either (from the consumer standpoint). I wouldn't break the law to smoke pot, nor would I break the law to eat Norwegian food. But if either was suddenly legalized, of course I'd go try them out a few times, why not?
BTW, prior to legalization, there were more Medical Marijuana dispensaries in Boulder than coffee shops.