So I wanted to start a marketplace where businesses like restaurants or cafes or bakeries can sell off unused or old machines/equipment they no longer use. Would it make sense to be so niche or should I just be a marketplace where businesses can sell whatever unused/old inventory they have? Like unsold clothes?
Good question. Which idea makes more sense? You could organize a survey to be distributed to a small group of people that represent your potential clients. See where the demand is and make your decision on that. The less-niche approach sounds sort of like Craigslist, which might be hard to compete with. For that reason, I'd probably go with the first idea. But you may want to survey your audience first.