Hmmmm. As much as I'd love to have access to the all so famous CCR, I've decided to set my goal at Gold. The cost to benefit ratio is too low for me (the CCR is the only noticeable one).
As for the cost, I don't think it's that much of mistake. It's highly possible. LHR-HEL return in J (last sale price, which a lot of us took advantage of) was 240 GBP, for 160 TPs. You'd have to do 31.25 of these to get to GGL, so that would amount to ~7.5k GBP. It's quite doable, even for us in the UK... Don't forget some of the F flights will have been done via uuA.