Adding to the definition and resource that nostr:npub1cxp3l03x20mkzezzr4takm8w8zuva7xwvacmcewp97z58hjt8xls3mexlq provided, my personal understanding has been it can be a repeated phrase or "slogan" that makes it sound like something of virtue is taking place when nothing particularly substantive or qualitatively different is actually happening.
Discussion
But "value for value" is the true virtue ..
Why must there be an expectation of a profit in every transaction
Eg - I cooked dinner for you - you took my dog for a walk - value for value - where is the profit here ?
Value for value as it relates to #podcasting or #nostr means - you pay ONLY if you find value in the content .. on the same token , it expressly forbids you paying if you didn't get any value ..