Looks like this pitomba is a fruit bearing size. A small 1ft tall seedling costs $25-$30 online so definitely grab it if it is cheap.
Worth growing or not depends on your taste preference. Have you tasted it before? To me it did not taste like apricot, tasted similar to surinam cherries but i am keeping mine to see if the taste improves with time and nutrition. You could always let it fruit in the pot and if they don't taste good to you, sell it.