The potential problem that I can see is this: Many factors come into play when determining the success or failure of a business, especially on a marketplace as competitive as eBay. Vagaries of the market, changing consumer tastes, customer problems, competition, etc. can all affect the outcome of a business plan.
Whenever I find a new niche, I prepare a mini-business plan. I calculate my product costs, shipping costs, estimated selling price, demand (number of sales) and try to figure out my profit on a monthly and yearly basis. Over the years I have done hundreds of these. And NOT ONCE has it worked out exactly as planned. Some niches did better than I planned, some did worse and a few were total losers.
So, when someone tells me they have a plan to sell on eBay to make $x by such-and-such a date, I get nervous. Experience tells me that it may or it may not happen.
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