Were the Spanish Netherlands all that profitable? I thought Austria didn't really want them and treated them as an afterthought? France wanted them for security purposes, and was willing to let Bavaria have them in WoSS. England/Britain and Dutch didn't want the Bourbons to have them for security purposes, but never really tried to take them.
My impression, aside from the military factor, was that they were mildly profitable, but not any sort of cash cow.
Certainly, when you had up the Spanish losses - Netherlands, Sicily, Naples, Sardinia, Milan - various sources of income were gone.