did you?
I never change once in 5 years, just ketuk2 clean it only. I think this could be one of the reason why the motor Kaput

U lucky la bro. Mine 5 years ++ but I dont use everyday. I have DC38 which is around 8-9 years kot, still running strong.

Teringat my dad old vacuum by Electrolux the long type model. I remember dad using it since I kindergarten and last raya I pull it under the bed, still working and sucking. Wish modern vacuum can last like that.

Manufacturing plant cost, Raw Material Cost, Labor Cost, Licensing Cost, etc are not under Dyson costs already because they outsource the PCBA and complete assembly. These are under the contract manufacturer. Logistic, Marketing, etc are generally the same like other manufacturer with similar products. Main cost for Dyson is basically R&D.

I used to work in a US company with staff around 100 person only, producing telecommunication product. The PCBA and other mechanical parts are being outsource. Final assembly and testing is done in company factory. We were making like USD30 mil. I would say huge margin compare to cost because product is not end consumer product but communication industry players. Provide 2 years warranty. Unlike end consumer products, you do not need to come up with new model every year like smartphone 

I'd say Dyson has established to put its name as luxury item like Apple. Marketing is good so the consumer are willing to pay to its price.