To be quite honest, I don't think Mac's are getting more overpriced. I think they're starting to offer more for the money, now, than they used to with their products.
I've also noticed that to buy similar specced laptops from many other well known manufacturers, you're paying approximately the same price.
Well, if we assume Apple doesn't overcharge their products, then how come they constantly have the highest profit margins in the industry?
Everywhere I look at Apple, I see a business model extremely focused on emptying your wallet. For example, they divide their Macs into tiers; lower, middle and high end. Usually, the lower one would be fine for me, if I could just upgrade the graphics card, or similar. But they make it so that you can only get the best graphics card if you buy the high end model.
There's really nothing preventing them from offering the choice of letting you customize the lower end one with it. But they deliberately force you to pick the higher end model, thus paying more for other components they include as well, which you don't need. Overall, they are in total control, and they make a higher profit.
Their incremental hardware updates to their products every year fits into this scheme as well. Great, so you get 1 GB of RAM now in the latest iPhone. Well, they could have included that in the previous iPhone as well, would probably cost $5 per unit for them to do so. But then that iPhone would last longer, and they wouldn't be able to drop support for it when some apps/games comes that require 1 GB of RAM. Or the OS itself.
Their whole model is based on giving you as little as possible for the money, and making your purchase as obsolete as early as possible.
Of course, all companies do this. But Apple is leading the way, proudly.