150k as an amount is very relative, for some is high for some is low. This goes for the wife's view. Also depend on whether that 150k could have gone somewhere better.
To be fair, if you have 150k lying around doing nothing, sitting in deposit, actually buying some watches are not a bad move - enjoyment + return!
Anyway, as a family all decisions should be make together. If she is really unhappy, then just work it out.