Wanting to lose money and being able to afford to do so are two completely different things.  You obviously dont want to lose your investment.  But you have been living without that $10 a month for a decade, so you can clearly afford to lose it.  Yes, the first rule of investing is only risk what you can afford to lose.  After that, the next most important rule is to diversify so you dont have all your eggs in one basket.

Wanting to lose money and being able to afford to do so are two completely different things.  You obviously dont want to lose your investment.  But you have been living without that $10 a month for a decade, so you can clearly afford to lose it.  Yes, the first rule of investing is only risk what you can afford to lose.  After that, the next most important rule is to diversify so you dont have all your eggs in one basket.