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[webmasterworld.com...]
Two examples:
Your performance can suffer if the host overloads the server.
If you choose less than well, you may select an outfit that has your site on the same shared ip
as 20 or 200 spammers, potentially causing you to be guilty by association for being in the bad neighborhood.
I've not suffered any negative experiences and I have used shared hosting for a few years. Whether it's because I've managed to chose well, or whether it's pure dumb luck, I dunno.
Caveat: I'm not a pro like most of the folks here, it's more a labor of love and hobby obsession on my part. I do ok by my lil' labor of love info site, but even if it were to fall completely outta the serps, there are other options I can explore for promotion. If this were my bread/butter, I'd probably heed more seriously the concerns of shared hosting.
That being said, I'm fairly certain many commerce based sites manage to exist just fine on shared hosting, though probably not the biggest of the big boys and girls.