I have no affiliation with amigakit.com, but even I see where he's going. He's trying to specifically sell for the future Amiga platform (which is made of mostly generic PC hardware) and fill a niche by providing Amiga-related expertise and advice.
A dealer CANNOT support the antique Amiga doorstop and hope to survive. You can't BUY new replacement custom chips, or new Amiga monitor cables, or new Zorro cards, or PCI Busboards (well, I believe you could a couple, but you'd have to have the initial money to pay for stock, which I'm sure he hasn't). Tower cases are generic, systems will come when possible, I'm sure. Kickstart ROMs are all gone, and A1/Pegasos boards are very difficult to come by without a {bleep}load of startup capital.
If you want old {bleep}, go to ebay.
All in all, I believe that Amigakit.com is well worth supporting. If you can't understand what he's trying to do, then this community doesn't deserve ANY dealers.
Kudos to them for at least TRYING to support a defeatist market.
Wayne