Of course a grower is going to look at any retail price and think it absurd. That $50 shirt you bought last week cost the mfr 39 cents in Malaysia.

If the wholesale price that shops are paying growers is around $4.50 / gram ($2k / lb), then $20 seems like highway robbery. Until you figure that there is a full retail operation incurring salaries, insurance, infrastructure, licensing, distribution, etc. Tons of overhead.

The effort and expense of growing myself is far outweighed by the awesome convenience of buying any of a dozen different varieties from a dozen different shops at a higher price.