An editorial in the WSJ today posited just that.
I know its the truth.
I ordered a half tank of propane that came to about $4.19 per gallon with all the extra surcharges included.
I immediately started looking into buying my own regulator and lines for running hot water and stove off 100lb tanks. Turns out that propane for “farm use” is considerably cheaper. They aren’t supposed to sell it to me at farm use cost but if I have my own tanks to refill, few sellers ask.