I hope you are right and that ATI agree with you but I don't, I think ATI will make more money selling the 5870 for £285 at launch rather than £225.
I know you don't, it's because you don't seem to understand how it works.
I'm not trying to be condescending of course, but I think you're having difficult grasping how companies price things to sell in volume and not to sell for the highest profit on a per item basis.
Which makes more money in total?
£300 at 1000 sales, or £200 at 100,000 sales?
Basically, at £285 they will make money money per card, at £200 they'll make less money per card but sell a lot more.
Say there are millions of people who would buy a 5850 at £140 but a 5870 is out of their budget.
Say there are hundreds of thousands that will buy a 5870 as they can afford it.
The 5850s are going to make the most money by sheer volume of sales. Add to that the ease of crossfiring and you'll see why people are more likely to buy cheaper and therefore maximise sales and also profit.
Don't forget, the rise in price isn't proportionately related in to the difference in money.
A difference in £85 isn't directly proportionate to how many more or less people are going to buy it.
£85 extra is a massive reduction is prospective buyers, you're looking at a fraction of the people who would buy a 5850.