Seriously, I understand the frustration of feeling like you're being forced into a purchase you wouldn't otherwise have made, but a) you, personally, aren't being forced into anything, and b) pretending that the only choices are "Spend £25 On A New Core Set" or "Don't Play Tournaments" isn't terribly helpful.
Actually I only have those two choices. If I want to buy a deck of ebay the shipping alone is already $25.
So yes I am forced to buy the new starter. I enjoy X-Wing competitively and have spend too much money to just stop playing.
Also: The core sets have only just started getting wider distribution than a couple of US retail chains. There's two months for them to start filtering their way into wider availability (and popping up on the secondary market more often / in more places) before you actually need one.