Correct me if I'm wrong, but investing $6600 for a $20/month return is going to take 25 years to break even. How is that worth it? (I'm totally naive about investing. This isn't a dig at you. Genuinely curious)
If it was purely the cash flow you wanted you would buy a bond, but once the bond period is over that's it, you own nothing except the cash taken out. If you want to accumulate wealth but not necessarily cash flow high growth stocks are probably a better option.
As for breaking even, the security is highly liquid and can be sold at any time to recover one’s capital.