People saying how often or how much they win is meaningless, unless it's considered in relation to the amount they have invested. I could tell you I have a savings account that pays me £300 a year interest and another that pays only £6, but how much use is that information by itself?
With PB your capital is safe but diminishes in real value. You are gambling with the interest, so it can't be relied on to give regular dividends - your interest may be double the average, or it may all go to someone else while you get nothing.