I think all these points make for excellent negotiations.

You already have a list of jobs and potential costs that you can rightly say have been listed by a qualified BMW technician and, thus, you think the price too high. If you can knock another 500 off the asking price, that might sweeten the pill.

But I will say this: I bought my TDM about 3 weeks ago. My first bike buy since riding my Transalp 600 (which I'm keeping) over to Estonia in 2009 (IIRR). I plan to have weekend rides and hopefully some European touring with my girlfriend (please lift the border closures by August!!)

It was not particularly cheap for what it was, Estonia's market not being a large one, but there you go.

Since buying it I have had do a full service (oil & filter, cleaning and bleeding brakes, greasing linkages and axles, new spark plugs, new air filter, insulating the HT leads, new tyres, new rear wheel bearings, new rear disc and pads).
The head bearings need tightening, potentially replacing, the fork oil needs changing, the cam chain tensioner is being done under warranty and I'm opting for a valve clearances check preceded by a cam chain renewal (my choice).
Being a used Italian import, the bike itself is cosmetically very tidy with no rust and came with a full givi rack and that was a bonus.

But what's my point, I hear you cry....

My point is that sometimes it's worth waiting and paying that bit more for a bike with fewer unknowns.

Yes that bike in question has accessories and yes it's a good price, but there are a bucket load of unknowns. They might amount to nothing, they may amount to a 4-figure sum that doesn't start with a "1".

At this juncture, were I to be presented with my TDM and what I know now and another with fewer KM and/or a full service history and work done for an extra 1500, I'd probably go for the latter just for the sake of peace of mind.

You are not buying a weekend toy.

You are investing in something that will keep you alive (you don't want to breakdown midway through the Gobi) and keep you moving.

A RTW trip doesn't work if you are stranded.

I'm not trying to be a voice of gloom, but I am trying to potentially remove a source of concern and stress from the equation.

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Adventure: it's an experience, not a style!
(so ride what you like, but ride it somewhere new!)