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Making such a mod is not difficult, because the xml and tuning files are usually pretty self-explanatory. What is more difficult is finding the right resource.
There are tutorials here and elsewhere for tuning mods (xml and ITUN). The one I used was by nonamena:
http://www.simlogical.com/ContentUp...e/uploads/1613/
Now as to the resources, the ones I have found after a quick search are the xml files for the Theatre and Stadium rabbitholes in GameplayData; both have values for the payout during concerts (600 for theatres and 1200 for stadiums). But these values I found are somehow at odds with what I remember from playing rock star Sims, so there's also a chance that another file or the game core overrides these values, too. If it's the core then that means that you cannot make a simple override. The only way to find out is to test your mod in-game.
If you decide to make that mod and upload it here know, however, that I will be one of the first to comment because that mod would conflict with mine. So I really hope that no such mod exists nor ever will