I did purchase a portable oven that uses the 1 lb. propane bottles but can be hooked to a large one. I can bake bread or anything with that. I guess compare that to your adobe oven. I spent $120 and you spent nothing.
I can't compare myself with you as you are the master.
Besides, building the oven gives me something to do while I wait.
I expect I'll be selling some bread from it in the future. It's big enough to do a dozen loaves without crowding.
Probably cook 6 pizzas at one time.
/johnny