Unless you can get the full service history on it, you would be taking a huge risk buying that car. And it is a bit pricey.....

In the last 10k miles I have done enough work on my '03 (now at 100k miles) that it would have cost far more than $10,000 to fix, including removing and disassembling the gear box and at that time I also renewed the leaking v-pan gasket. That was about 5k miles ago. It is running like a charm but I still need to change the valve cover gaskets and I think I need to replace the chain guides and maybe the chain.

So, if you have the FSH and a lot of this has been done the car would be worth buying. If you don't know the history, the car might wind up costing you the same amount again in maintenance.

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.