Everybody would be better served if we could stop comparing apples and oranges- a car like Howard's IM/6 shares nothing but a basic shape with a 1600cc Vintage. Both cars are perfectly fine for what they were intended, but they are as different as a Miata and a 911 cab.
To carry the analogy even further- I can easily see a Miata owner saying something to the effect that he's got 90% of the 911 for 1/5 the money, and a 911 owner looking down his nose at the Miata guy for his plebian little Asian roadster. However, I know lots of guys who start out in an inexpensive sports car, and slowly move up to something they never thought they'd have a chance to own as their situation improves. I'm a guy like that.
The guys I want to hang out with are either looking down from the top at an old MG or Triumph, and thinking how fun they were, or are looking up at the guy in the 997 and thinking, "that's really neat. Maybe someday....". The last place I want to be is in the middle of a bunch of dogs peeing circles around their respective socio-eco trees. It's class envy and warfare, pure and simple.
Vintage makes a fine $25K speedster, Intermeccanica builds something on a completely different level. I've owned speedsters from three different companies, and worked my way up the food chain as my job and situation allowed. I've got no animosity for anybody's choice of car, as long as they don't try to justify their own choice by putting down everybody else's. Genghis Khan said, "it's not enough that we succeed- everyone else must fail." That's complete balderdash.
Paul Harford wrote an excellent comparison that is at the top of every section as a sticky. Everybody taking a deep breath and reading it again would be a great idea.
So, "are these Intermeccanicas worth the price??". Absolutely. Does that mean the other builders cars aren't? Absolutely not- and I'm not sure how you get from here to there.
I own an Intermeccanica. I don't think I'm better or smarter than anybody else because of it. I really do like my car though, and I'm not going to apologize.