They are technically reusable. I don’t doubt most people buying a reusable bottle get at least a few uses out of it. However, you have to deal with the risk of

They are technically reusable. I don’t doubt most people buying a reusable bottle get at least a few uses out of it. However, you have to deal with the risk of misplacing it, theft, destruction, moving without taking it, etc. All of these risks make the value of the reusable bottle possibly better but the low cost of the plastic one use bottles are a real benefit that can be immediately realized