Hi Richard,
It might be worth a cost-benefit exercise - to figure out what could need replacing within the warranty period.
For instance, you have 65,000km on it - so about 15,000km or so until the front LCAs will need replacing. 
Other items which 
might go next (once you get over 100,000km)  include water outlet, wheel bearings, alternator, starter motor, steering rack, etc. 
Hopefully you have changed the ATF and gone to a steel sump for your ZF. 
In the end, I really think it not only depends on your well you have it serviced, but also on your luck! 
I risked it and never got extended warranty for my D4. In that time I had to replace the alternator and starter motor. That still wouldn't add up to $5k. FWIW, I bought extended warranty for my new D3 at the time I purchased it... everyone told me I was mad - it was $1400 back then. It did pay for itself after the front wheel bearings and steering rack had to be replaced - just before the extended warranty finished. 
 
I've seen that you can negotiate the pricing on the LR extended warranty - but $5k is still a high starting point, IMHO.
Cheers,
Rob
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