Part of the reason ours cost more, is because of the harder, more durable materials used (which wears out tooling faster than a material like Aluminum) and the years of R & D that goes into development in a very fierce market. All-be-it a small market...it's still fiercely competitive...even though they all support the over all goal of getting suppressors off the NFA list.
Any jack wagon can make a suppressor in their garage for a few hours of time, and a couple bucks worth of materials...they aren't that hard, and some can be pretty effective (but you still have to register and pay your tax for what is called "A Form 1") but you'd be hard pressed to make anything home made that is on the same level as a more precision designed can.
The technology that goes into the design makes them more expensive.
Interesting to see the diference in price and focus on durability. Here suppressors are becoming very normal and a huge amount of hunters are using them from "high tech" guys with the best equipment to the very basic hunters who have only the mininium gear "needed"(now a suppressor seems to be in that gear list along with a scope).
The main focus of manufacturers here seems to be weight and price. Because they have become so popular with no restrictions every hunter wants("needs") one now.
A huge number of hunters now "need" suppressors and they become the norm along with scopes.
All gun stores I have been into in the last year are selling rifle+scope+suppressor packages off the shelf as standard.
I think this is why there is such a big difference in price and materials used.
Will be interesting to see what happens to the price/materials in the US if or when suppressors become more widely accepted and used.