Nope, it's just greed. Any Intel processor manufactured in the last 5-8 years is much more powerful than A4 so it's not a valid excuse. Desire to maximize profits by leaving customers out there without support is the only reason.
Do you have a better label? How about "out of love for their customers"? Does not sound right, does it?
How bout you get together with all your friends, create a new tech company and give it all away just for the "love of your customers"?
No, I know, its just easier to bash companies for trying to maximize profits. If Apple's prices and practices really were absorbent another company would, maybe yours, come along and undercut them and put them out of business. That's how a "free" market works. Vote with your pocket book if you don't like it. A company cannot charge more than people are willing to pay.