Well, the 2 LFS's that I most frequent are actually online 24/7 right at the front counter, and I can think of at least a few more that are as well (i.e. the last one I worked at, all the importing from Bali was arranged online via emails). You are correct in so much that LFS's do rely more on weekly instock lists from suppliers coming by fax (or some by email).
Of course, there are two main ways LFS's find out about sources. Either the source seeks the shops out (i.e. coldcalling) or the shop seeks out the source (typically through trade journal listings / directories). Of course, look at a site like Frags.org and you'll understand that there is potentially a HUGE "market" out there in direct & local sales & trades too. I.e. I have no interest selling my 14 available (6 now spoken for) GBG's at a wholesale level to a shop....not enough money in it to make it worthwhile considering a YEAR of failed breeding efforts. I'd be much more interested in selling the few fish I have to other breeders and hobbyists than taking them to the shop to sell them at less than $10 each. For now, my avenues to reach the local individuals I want to sell to are eBay, Aquabid, and forums, as well as digging through emails and PMs to see if there's anyone who expressed an interest that I haven't yet talked to.
Selling small batches of fish out directly to fellow hobbyists, you can still actually get a retail level price for CB marines...can't say the same for most any FW fish...hobbyist to hobbyist prices are now often lower than wholesale (as a shop manager I literally used to clean up at the Cichlid auctions...i.e. getting several bags of fish that might have a wholesale value of $20 for only a buck!). The advantage of not selling to LFS's, but seaking out hobbyist connections, is that it at least makes breeding and rearing marines a "LESS LOSING" proposition, especially with a tiny batch of fish. It'll be a different story if I have a few hundred Onyx Percs to move, but on batches I and III, only 3 remaining in each batch, why part with those for $10-$20 a shot when I can find the handful of folks who are willing to give me $40-70 each?
I guess what I'm getting at is that it isn't just LFS's who buy CB marine fish, in fact until more hobbyists are willing to spend the cash, or WC fish keep going up in price and reducing in selection/availability the LFS's could kinda care less (as a general concept, forgive those LFS's that "DO" care).
One other way a simple open forum along the lines of Frags.org could benefit is to facilitate TRADES between small-time breeders and basement businesses. I.e...David has Fire Clowns, more than he can move, and Joe has Clarkii, more than he can move. I smell a swap in the works, that ultimately benefits both breeders by increasing selection (and thus interest and ultimately revenues) for small time operations. Or for that matter, maybe David wants to put Onyx clowns on his list...maybe he finds me and I'm willing to work something out for a couple dozen rather than flood my very limited local market...maybe he has a spare pair of something breeding that I don't...I smell a trade....
I guess the biggest thing is that the more "exchange" of both knowledge and actual CB marine fish, the better off everyone can be. That should be the main goal of any such organization / website.
Matt