I have a grand total of 3 (!) PBs given to me as a birthday gift years ago by an aunt. I've twice won €75, which I reckon is a pretty damn good return by any standard
my sister gave me €600 in prize bonds and a week later I received €75 as a prize, as an experiment i invested over 100k for a short period less than 6 months and won roughly equivelent to the the prevailing interest rate after dirt
you win some and you lose some,