Caitlyn Jenner -- Five Times More Valuable than Bruce

Caitlyn Jenner is a hotter commodity than Bruce Jenner ever was ... especially on the speaking circuit.

Sources who worked for years on booking speaking gigs for Bruce tell TMZ, Caitlyn is worth 5 times what Bruce commanded. Our sources say Bruce used to get $25,000 a pop for motivational speaking ... and they say Caitlyn can pull well over $100k.

There's a big reason Caitlyn is a hotter commodity ... social media. Bruce hated social media and wouldn't play ball. A lot of the companies that hire motivational speakers are big into social, and Caitlyn is fully on board and breaking records.