No, rebalancing a two-asset universal portfolio (levered QQQ and cash, which can be negative), in the absense of transaction costs (that's why RobinHood and MOC), should increase your absolute and perhaps also your risk-adjusted return.Let me see if I understand what you were saying: When you do levered QQQ, rebalancing will worsen your absolute return?
Google the terms "volatility pump," "universal portfolio," and "Thomas Cover." Since you are taking an Excel VBA class, you might be interested in the vol pump excel/vba code posted on the archived Gummy Stuff website.
