Bad analogy. You can still put $100 tires on it if you wanted to.
Also, why are you assuming that someone is going to buy a VGA only monitor instead of already owning one?
Technically you can put 100$ tires on your Ferrari, but it's unusable. Most "luxury" cars prevent that by using some kind of special rims with the "right" balance. For example, you could use a normal rim to mount the tires of an Audi, but your car would wobble on the road. If a 30K Audi does that, I doubt a Ferrari would let you put whatever you want... especially from a company that does a research on you before they accept to put you on the waiting list to buy one.
So, yes my analogy wasn't perfect in every single details, but you're missing the point. A 400$ card has higher standards a low class card doesn't. You can't blame the company for not making their top of the line product for the bottom line users. You want top of the line, use top of the line. A better analogy would be blaming Ferrari because the engine doesn't use fuel with the lowest concentration of octane. If you can't afford the fuel, you can't afford the car, it's not the company's fault.
As for assuming the VGA monitor isn't already owned, I didn't. But eventually you have to realize technology moves on even if you don't. You can't expect every piece of hardware in the next century to support a technology that was already obsolete 10 years ago. Sorry, but it doesn't work that way. If you're willing to pay 400$ for a video card, it comes with the requirement of having a monitor that will give you what you paid for. VGA doesn't give you what you paid for your video card, simple as that.
And for the record, I'm no AMD fan boy. I'm a current happy owner of a 770 GTX and it would take a complete turn around to get me back in the AMD camp after suffering for years from the bad driver interface. I simply support the fact a 400$ card should require a monitor that wasn't built in the VHS era...