If there is no artificial light, maybe the buds are a little less dense, or maybe the terps aren't maxed. Who cares? The proportion of consumers who cares enough about these super high-end aspects that they would pay significantly more is tiny.
This.
IF the (legal) market for Cannabis becomes big enough that it will be worth it to run large green houses, the people with the money to invest in such facilities will do it, they will grow flowers that will be more than good enough for the general market at a price that nobody running a small-scale operation will beat. Period.
As long as taxes put a price floor on the weed, it could still be profitable to grow for the black market -- but that says nothing about the true value of Cannabis, it's a matter of tax evasion. You would be making your money from stealing taxes, not from growing something of "value".
The price of Cannabis will be that of basil, and since the genetics largely determine the quality, it will be good enough. The "connoiseurs" around here will disagree, but they are 1% of the market and the big producers couldn't care less.