I would take 2 steps backward, and first recognize that $15k is a healthy chunk of money. Then, I would ask myself whether there is something I want that would cost that much, or more, that may be for sale and I wouldn’t buy if I bought this? If the answer is no, buy it. To that second question, I usually answer yes (and sometimes ignore my own answer, buy it anyway, and get pissed off at myself later).
Also, ask yourself if it is a forever purchase or to be used for trade/sale later. If the latter, I would be more cautious about buying it for the reason you mentioned.