The 'extra' for Club on S/H is much less than the differential on L/H flights (where it can be 4 or 5 times as much). If you need fully-flexible, you may find that the extra cost of C over Y is minimal - I've personally seen a £2 differential on a £400 ticket!
On this basis, Club can be good value - lounge access (if you're not a FF), a seat near the front and more luggage space (my suit bag goes in the 'wardrobe', where available). And then there's the free champers, of course ...