Stop being deliberately obtuse. You know very well what the poster meant is a machine:
- That does not have a built in monitor.
- Has a discrete graphics card that is user upgradeable after purchase.
I'll even leave off the PCI expansion slot business that normally is part of this type of request.
They want a machine that is a regular desktop computer but without the expensive professional graphics cards, Server processor, or ECC RAM the new Mac Pro has. The iMac is not a traditional desktop computer, it's an All-in-One (i.e. a laptop computer built on the back of a monitor too big to be portable). The main market for the AIO is consumers who would be perfectly suited with a laptop performance-wise, but don't really plan on taking the computer anywhere to start with. It also has the added benefits of being easy to set up since you don't have to connect the computer and other components together (it's pretty much the same as the original iMac in this regard), and it takes up less space than a desktop machine. It's an "appliance computer", a "mom computer", but it's not a replacement for what the poster is asking for.
I like it when folks try to pretend this type of machine has no market simply because Apple does not offer it. A desktop mini-tower is the most popular form factor of Windows PC, which is still what 80%+ of people are buying when it comes to computers. Stop trying to explain away this form factor's popularity and funnel these users into a Mac Mini, or an iMac, instead claiming that it's the machine they really want. It's not. And to say otherwise makes you look like a bunch of kool-aid drinkers with no balls to ask for what you really want in a PC because Apple must Know Best.