Excellents posts above. To the OP, sometimes, I feel the same as well. I have a 2004 X5 3.0i that just turned 98k last week (bought it used in Jan 08 with 50k on the clock). She handles great on long trip and around town, but she does lke to hit my wallet a lot. So far, after two years of ownership, I've replaced:

2 sets of Michelin tires
Smog (air pump) and valve twice within two years (items failed just out of warranty)
Various interior trim pieces (front pillars, door threshold pieces)
Both front half shafts
Transfer case (BMW goodwill warranty)
Front winshield washer pump)
Front and rear brakes (maintenance items)
Normal wear items (wipers, plugs, air/cabin filters, oil changes)
Front suspension components (bushings, sway bar end links)
Water pump and coolant

And now, the front differential is making some noise now. I'm going to change out the diff fluid to see if it helps any.

Daniel

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2012 Enclave
2010 F-150 XLT
2001 330i