It is simple, guys. Festool carved for itself a niche in upper end tool market and created a very successful marketing / advertisement tools (like FOG) which keeps owners engaged. They do not directly compete with box stores brands, very much in the same way as Chevrolet does not really compete with Lexus or Acura. They have a narrow market in which they enjoy monopoly and can set the prices as high as the market can tolerate. I bet they look at sales of each item every year and those which sell well get price increases... until sales slow down. They do not care about us complaining, in the same way how they consistently ignore proposals for improvement that come from end users.
It is an "investment" only because they fixed the prices and because they always raise the prices. Well, it is not really an investment because tools depreciate and spare parts cost a fortune. But at least one can sell a tool for more than a garage sale price. Anyhow, if they had "40% off" sales and dealers could sell them at any price, as any other brand, and if Home Depot carried Festool, a 2-days old tool would sell for half the price of a new one. There is no magic. Limited supply, limited demand, and no price flexibility. This does not work as a growing market model, but apparently Festool is not going after someone's else market and is not trying to penetrate a lower end consumer market. They are happy within their little niche. Small volumes, good margins, good customer service for the owners.
No point in complaining. A premium price for a "designer brand" tool. Are designer brand clothes expensive? Are premium car brands expensive? Is premium sporting gear expensive? Are they worth it? Are they better? Do you need them? Depends on your system of values, you budget, and your applications. No right or wrong.
If you want to feel better... Their average annual increases is about in line with overall inflation. Government statistics tells us that inflation is on average in the ballpark of 3% per year. Some people think it is as high as 4 to 5%. Milk gets more expensive every year, eggs get more expensive, and so are Festool tools.