If it's what thing I'm learning from reading old posts, for sale threads, pricing reports, etc, on this page, it's that many high end headphones are increasing in price as time goes on. What is going on here? Across the board, headphones from Sennheisers to Beyerdynamics are more expensive today than they were 2-3 years ago. DT 990's? More expensive. HD 600's? More Expensive. These are just a couple of many examples I have found. What's the deal with this? I mean, the freaking 990's are almost 10 years old now. How in god's name is the price going up on them? Has there just been a complete and total lack of advancement in headphone technology in the last 5-10 years?