Perhaps a bit of clarification is in order:
A warranty is a legally binding obligation by the manufacturer. It provides peace of mind to the customer to buy the product, knowing that if something goes wrong, it will be sorted without quibble. It also works as a marketing tool (just ask Kia how successful it can be).
Just because this period expires, doesn't mean it's fair to assume that any and all mechanical or manufacturing failures are no longer the responsibility of the manufacturer -indeed, there's another legally binding protection here for that exact reason (Sale of Goods Act).
The bottom line is, do you feel it's reasonable to be left with a £3000 bill for a clutch assembly which disintegrated (not worn out) in a modern car within 30000 miles or 4 years? The nonsense about other manufacturers not looking after their customers out of warranty doesn't wash either.
And no one's "slagging" anyone. For the same reason that you think the dealer is shortsighted in your follow up post, I feel Lotus would be smart to engage with the very group that is most likely to buy its cars. Paying for parts would have cost them nothing, and a small contribution to labour costs would have left me with a much more reasonable bill.
As a disclaimer, I adore my car, love the Lotus philosophy, and have been treated courteously by the service dept at Hethel and my local dealer. I just tend to be more objective about the real world, and less "cultish" about a car brand.