Really? I love the term "Excessive Steroid Use" being used in the same paragraph as "Illegal Drugs". For that argument to hold any validity you have to drop the word "Excessive"; frequency and volume have nothing to do with it i.e. One low dose of "T" is fine but do it for three months at 700mg and there's a problem?
Now for the word "Negative", so if the positives can outweigh the negatives, you're saying she should be good with that?
And lastly the "Making a living being muscular" statement. So if he can show a positive financial gain, assuming your rational is monetarily based, she should be good with that also.
To summarize this; No wife should have an issue if you use illegal drugs just on the weekends and can sell enough to support your habit.