I dont think your lawyer is right about if you lose your job it doesnt matter.
you can only pay what you can actually pay.
Im not a lawyer but i went through something like this in the past in regards to child support.
you have to pay a slice of the money you make, if you lost your job and you are not making this money anymore, how will you pay any more than that ?
if im a rocket engineer but i cant find a job, will i still pay what other rocket engineers make ?
I might be wrong but I think you will only pay a percentage of what you actually make
2010 M3 Jerez Black Metalic, Premium Package, Technology Package, M Double Clutch with driveLogic