I'm working the numbers from our annual survey and found this:
Product managers who have attended our seminars make $101,717 while those who have not make only $96,558.
Sure, it's not a lot but it's the difference between a 5- and a 6-figure income. Of course, I don't know if it's correlation or causality (or even what those words mean specifically); I'm just reporting the facts.
Blatant sales pitch :-) Invest in your career. Come to Practical Product Management or another Pragmatic Marketing seminar. Your checkbook will thank you.