Just to correct a small matter. The "leverage" in this case is costing the OP more than the asset is earning. The sock at the bottom of my cupboard gives me a better return than that. I'm not advocating equities either, I'm just highlighting the costs versus returns.
Your sock will give give you zilch return one way or the other over the next twenty years. Beause the cost of funds exceeds the return at present( in this particular case) does not mean that the investment won't show a positive return at the end of twenty years. ( which, imo, is the timeframe for an rpi play)