Anyhow generally its a gamble undercutting a bigger competitior to increase market share if it turns into a price war 9/10 the smaller one is gonna end up pricing themselves out the market - as a generalisation of a 2 player market as intel doesn't really have much clout in this case. ATI has played the game well recently keeping the prices competitve and keen, staying on the front foot without over-reaching themselves... dropping prices as your suggesting at this point just to increase market share would be unnecessarily exposing themselves and doesn't make good business sense and I don't see ATI doing it out of kindness. From a business perspective it makes far more sense to play the numers I was suggesting as it leaves you a bigger margin to fall back into when the other side strikes back and leaves the competition less maneuvering space.
This itself is speculation though. Look at the 4800s, they've done exceedingly well with them, yet their actions go against everything you describe here.
This is my whole point, they price them at $199 and $299 regardless of how much it costs them to make, weather it be $50 or $80 for example, it's to ensure they're not TOO cheap and not too expensive.
Once they've taken off, they can lower their margins to increase the amount of people buying them.
This is EXACTLY what they've done with the 4800s.
A 4850 started off at £120 for the 512MB, now you can get them for under £80 for 1GB cards.
Loads of people are now aware of the 4800s and how good they are, so they're less likely to think 'ugh, that's surely cheap and nasty, look at how cheap it is'.