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i think it is probably a good idea for a small store that has excellent products.
i would also suggest doing some other promotion along with your yahoo store, like link exchanges, your own keyword domain, and perhaps a little ad well placed on a industry specific megasite.
but, besides the link exchange (which only costs time), it may be a good idea to wait a bit and evaluate your success with just the yahoo store before you spend more money on promotion, if your budget is very tight.