Agree with many things you are saying! Nothing wrong with your thought or your buying habbits 
As long there is people are willing to pay high price for someting, there will bee company that are willing to make that kind of product and charge the that kind of high price
Sony Z2 and Z3, is a bad example, lets take Samsung S2, S3,S4,S5 or HTC One X, One M7, One M8, what ever phone model. These company making better phone every year, pushing the development forward, but charge you the same price!!!!!!!! How would you react if Samsung charge 100$ extra for the built in fingerprint reader
? Rember, I bough a Dell top of the line computer in 2004 for 3,500 USD, ten year later (2014) i buy top spec computer for 1500 usd.
Same goes for BMW 320 that my friend bought new in 2003 for 45 000$ in European, and 11 year later, the BMW 320 still cost around 45 000$ but you get a better ca, newer, fuel effiency, better looking and so on. You even got bluetooth streaming in that car
. But BMW never charge you more for all the technology development. That is what i call development and Dutch engineering.
Just because some people are coming from a more expensive audio gear and find X7 cheap, doesn't mean Fiio X7 at 700$ is cheap!!! If one person that have been driven a luxury sportcar like Lamborghini he find BMW M3 at a much much lower price great value for the money, doesn't mean that M3 has a good value for moneu or cheap. It is hell expensive.
I find Fiio's product as cheap and have a good value before, but this is not the case anymore as they are raising thier price when new products is releasing. That is sad that some people here found it great value, properly they don't know how to spend thier hard earned money a better way Just like buying a new BMW M3 and thinking of that Lamborghini and remind yourself, what a great deal i have made, i have just bough a 5-8 times cheaper car, and dont forget keep smiling
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