There's many contributing factors in why prices increase. I think in Germany the introduction of minum wage back in 2015 and the gradual increase of it since is one thing. Even if the employer was already paying over the minum it still makes people think about how much their worth over that minimum.
The cost of materials has certainly gone up. It's not just the wood and metal that goes into the rifle theres also all the tools and machinery that needs to be added, repaired, replaced.
More health and safety has been introduced, insurance has gone up, IT costs have gone up, energy costs, logistics, the list goes on.
Then your importer wether it be Hull cartridge, SGC, whoever, take their cut based on their costs ect. Then your RFD has to make a living. Now scale all that up with all the taxes and duty imposed on absolutely everything involved and there's your answer.