Because cash has been one of the performing positions in the year since you wrote it. Generally, if you took margin loans and invested them in risk assets, you got destroyed.
Regardless of whatever this investment is that's paying you 8%, your characterization of "almost no risk" for such investments is borderline irresponsible.
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Sure... that's technically true, but "keep your money in cash" is historically a really bad strategy. My portfolio is down 9.82% vs 11.32% S&P, and of course I also made 6% on around 50% of that (almost no risk 8% vs ~2% interest), so that brings it to -6.82% vs 11.32% S&P. Really not sure what the beef is.