Abundance Juice ala Jeff Walker

He was publishing a free investing newsletter in the 1990s. The owner of a competing website emailed him, asking to know how he created stock market charts displayed on his site. And these charts were his site's only unique differentiators.

Should he give away his advantages so easily?

Jeff Walker reasoned with himself thus:

... if I had figured it out, he would certainly be able to. And why put him through the day of tedious trial-and-error that I went through to learn how to do it?

Frank Collar, the rival site owner, in turn, offered to help Jeff publish a paid newsletter. 

Abundance-based mindset or scarcity-based mindset, your choice to make.