She is not contributing equally. No matter how much a woman makes, she still expects you to be the breadwinner. The more a woman earns, the more she expects her ideal man to earn. Chick 2, earning $100K+ will not respect her mate earning less than her. Career women still want you to be paying the mortgage and bills.
Men, we can’t change a woman’s software. It’s how the creator made them.
You can earn around the same ballpark and that be perfectly ok. Yes, ideally you will want to make slightly more, but if you don't, you should be expected to bring other things to the table then.
If you are earning less, it should be assumed you have more spare time then. If you show you are using that spare time productively, perhaps to open other income avenues, this can be justified.
Maybe you use that extra time to enhance your physical well being/fitness. Time is money and often times the extra hours at some positions, and the likely added stress, are not worth it. Especially if it means spending much more time away from your wife and kids.
Money is more of an logarithmic decay in most places that are not NYC or San Francisco in the United States. After a certain cut off there are diminishing returns for the trade offs required (for most jobs).