[citation][nom]dimar[/nom]So if a manufacturer like HP or Apple were to release the a netbook or a tablet with the same specs, a model with D2700 and another on with D2500. There wouldn't be a reason for the different in price to be $10.. But they'd charge extra $100! (in apple case at least $500)[/citation]
No. There are a lot of reasons they would charge more than $10.
Many things go into pricing different models. the raw cost of One part is just a tiny bit.
There is first the underlying hardware (cooling, battery, etc) for the faster processor. It will use a bit more power, generate more heat, need to be cooled. This can mean a different or bigger cooler with a more robust fan.
The cost of maintaining more than one product line. This is a large part of it too. Having more than one model of an item creates more work to keep them separate, differentiate them in design, shipping, packaging, marketing, accounting, parts, warranty, etc.. hundreds of factors.
The fact they want to be able to sell BOTH of these is perhaps the biggest one. They target the lower end one at a smaller price point, the higher one for a nicer higher specced (often with more options) version. Who is going to buy the lower end model if the higher end one is only $10 more?
They probably also want to make a profit, but if you want to start your own company that doesn't profit, never makes enough to re-invest in R&D, and goes out of business soon after, by all means, just use only your own money to do it.
Sorry, that is just how business works.