Definitely not mate. You won't have any trouble on most bikes at that height.
You're the same height as me and I manage fine on super sports bikes let alone a sports tourer.
It looks good in the photos. Low mileage. I can't tell what he's talking about regarding the dodgy paintwork.
I'd try and haggle that £99 delivery for free depending on how far away it is from you as £2000 is quite steep.
As for waiting until winter to buy, it is true that this is generally considered the best time to look for a bike but that doesn't mean you can't still get a good one at a decent price during summer if you look hard enough.
It's up to you what you do pal, I'd be very surprised if you ran into any problems from any Japanese bike with less than 30,000 miles on the clock let alone 10,000.
Well, that other blue one you found on gumtree doesn't have dodgy paintwork, hasn't been dropped, has done less miles, has a nice aftermarket exhaust and is £270 cheaper.
I'd say £2000 for the bike on eBay is a bit of a rip off, yeah.
I realise the issue for the one on gumtree is location but if you can find a cost effective way of picking it up that'd be ideal. If not I'd keep having a look round.
Personally, I don't know anyone who doesn't service their motorcycle adequately and that's simply because neglecting a bike can kill you. If the bike looks OK, starts, runs, rides and stops OK and doesn't bounce like a pogo stick then usually it's been looked after so proof of service history isn't necessarily crucial.
Make sure tyres and brake pads have plenty of meat left on them, the chain isn't orange and stretched, the sprocket doesn't have teeth that are worn down to a nub and neither the forks or rear shock are leaking oil.
Engine oil and spark plugs I'd change myself anyway as soon as I could after buying the bike just to be sure. I'd also check the wheel bearings before putting it on the road.
The thing about Japanese bikes as opposed to cars is if you maintain everything I've mentioned in this post then they'll pretty much go for as long as the rider. With the exception of them being thrashed around the road like a track bike.
This is why I wouldn't get too hung up on finding one with such a low mileage and 10,000 miles is miniscule.
108'c ? Lol
Just ask him about it and if he has a valid reason then I'd seriously consider that bike. Looks awesome.