and would it be fair to assume that the 50i comes not only with its greater power, but also larger potential repair/parts bills and potential failures like the 4.4 and 4.8 e53s?

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2005 X5 3.0i - 71k mi (9.2018) -> 81k (9.19) -> 100k 9.21 -> 123k (8.25)
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SOLD : ( 2003 X5 3.0 - 177k mi (9.2018) -> 186k (9.19) -> 205k (9.21)
SOLD : ( 1997 328is Coupe - Hellrot Red
SOLD : ( 1988 528e w/ Bullseye s256 / MS2 Extra / GC Coilovers / Yukon Coils ~ 300+ HP