eBay's official recommendation on this is that sellers should not even think about opening a store until they have at least 25 or more listings on eBay at all times, but I would venture to go a bit further. Based on my 8 1/2 years of experience working at eBay and being an eBay Powerseller, I recommend that new sellers wait until they have been selling for at least 3-6 months on eBay as well, and until they are already generating at least $500 a month in sales.
Additionally, once you have met all of the above requirements, if you're still struggling with obtaining enough exposure for your listings and/or getting enough sales, you should hold off opening a store until you've made more progress in these areas.
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