Pulling out the power suit again

I one again have a job interview. They are fewer and further between than I thought they might be. The thing about interviews is:
They expect you to really sell yourself, tell them why they should love you, then with the flick of a wrist they can dismiss you like a begging dog...
This is a tough market these days. The state I live in has a low unemployment rate, sure. But the rates are so high in other states that willing workers are relocating and taking the opportunities that might be available here.
In less than an hour, I will be selling myself once again. I will do my best to keep my chin up, my outlook high and sell my wares so to speak.
The last interview I went on, I thought I had it in the bag... but heard nothing.
That is a crumby way for a company to be. No correspondence at all? seriously? The four people I interviewed with seemed to want me to be a-one hundred on everything... including how I answered every question, my body language, my knowledge, my punctuality. I expected all of that. However on the flip side, they seemed a bit bothered that they had to take time out of their day to meet with me, there were very few slots of time that they could all meet with me, they screwed up the scheduling so that even though I was in the lobby 15 minutes early, I still met with the first one nearly a half hour late.
I left a thank you card to each of them, thanking them for their time. I walked out of the company with my head high, I felt I had blown them away.
I did not expect a letter explaining why I was not a good fit for their company- although wouldn't that be awesome? But was it too much to ask them to send a letter or even an e-mail in this day and age... letting me know that they had filled the position but not with me? That would be the polite thing to do. When they asked so much of me. (Note to managers: Let people know where they stand: Whether they are a new employee just interviewing, or a long standing employee I cant tell you how much better an employee I am when I know where I stand.)

And now, I am preparing to do it all again. Pulling out my new power suit. I'll let you know how it turns out. Who knows, I may just come out of this one thinking I really blew it, which may just mean I am a shoe-in!