thank you for playing!
selling stuff isn't strictly required to win, actually, as your playthrough demonstrated. it's only really necessary if you need more money, cause when the debt collector shows up at the end of the game, he takes into account the price of everything you have in stock, and not just what you have in cash.
however, i surely could have added some sort of small tutorial to make sure everyone figured out how to sell stuff from the get-go, that's totally on me! thank you for the honest feedback!