That's good.
However, you'll find that there REALLy is no "maximum" for shops. Many, many shoppers have made $75-$100 for unrevealed "video" shops and others have made as much as $350 or more for having "services" (Carpet Cleaning, Blinds, etc.) performed in their homes.
Keeep going for those high paying shops...they can be few and far between in many areas! Grab them when you can.