Maybe..but, they still operate like a business. You have to have stock/inventory so you can ship asap (delays will get you negative reviews) and this will cost money. You need to have items that are in demand - if you try to sell something people don't want or that many other sellers have available, you won't make much. The question is - how much of a real business background do you have. Are you familiar with inventory, supply chains, cash flow, bookkeeping, accounting, etc? Do you have a bucket of money to invest to get up and running and to sustain you while you build your business (you are not going to make anything near $10,000 overnight).