Corsair do not cover the postage cost. no.
If you send it back a second time they will cover the cost then. As in they will send you a cheque, (in euros,) after the replacement has been sent out and accepted. Literally 3 months later. you are correct other manufacturers do normally cover the postage, and do not generally require you to post it to holland.
You can try RMA'ing an item that's two years old but you wont get very far. I have done this, with amazon, ebuyer, they just refer you to the manufacturer. My issue is not just the cost, it's that it takes so long that you have to buy a replacement anyway. the corsair warranty is essentially useless.
As for the expected life time of a product. you are correct that the sale of goods act establishes a contract that lasts for 6 years and the retailer has obligations in this time. But without a team of lawyers to argue how long the expected lifetime of a wireless media drive is you are not going to get a retailer to change their policy which is generally that for consumer electronics that they will only act within 12 months and after that refer you to the manufacturer, which certainly if within the warranty period, they regard as meeting their obligations.