Listen to your wife.
Look man....many home rec guys have thought of the same thing as you.
You know, you get a little studio going at home. You fix it up real nice. A couple of your buds come over and maybe cut some tracks with you, and they keep telling you how cool it is, and how it would be great if you had more space and you could then record bands and make it a full time gig....etc...etc...etc.
Somewhere in the back of your head, the light bulb goes on....more like and LED....and all of a sudden the wheels start turning and you're thinking,
"Why not? I can setup a studio, bring in some bands, make some money, maybe even get to to do some really good projects with some top local musicians....hey, after that, word gets out, and I got better clients and the biz is rolling along."
Thing is....most of us who've thought of it, or even done it a bit at some point, and some who still do it....all know that it's a wet dream that as was stated earlier, can only survive as a labor of love, and you need to be willing to pour lots of money into it just because you love doing it.
Forget anything about a steady, serious recording biz....unless you can REALLY drop some major cash and set something up where the client base is willing to pay top dollar for the pro studio, where they can be pampered by the best.
Sure, there are smaller, commercial studios, but many have been around for a long time, and spent years building up their local client base.
I know of at least 4-5 of those studios in my general area. They don't make money, they get jobs occasionally, but far and few in between.
No one is stopping you...but man, you sure gave up on it quick....so much for *commitment*....or maybe, deep down you know what we're telling you, and you just needed to hear from a few other people besides your wife.
You have your home studio....why not use that as your test bed?
That way, at most you spend a little $$$ to just beef up your rig and get some necessities for recording more than just yourself. Do some solo artists who need track and basic production support...that way, you don't even need to think about entire bands coming to your home studio.
If it starts working out....then it will be easy to take the next step, and even your wife will see that it's working for you.