This would mean something like paying exactly what the valuation at the last round was, such that it'd cause the cap table to unwind leaving precisely $0 to split amongst common stock. It's not a huge win for investors, but if it's clearly not going to be a huge win, they get their money back (plus whatever conditions they had for more), and can move on.
> "For an the average rank and file employee who has been grinding it out at Wepay through the ups and downs I am imagining this might not be a "feel good" moment."
Probably not. I've had friends who have been at companies that have sold at these "big numbers", but come to the sad realization that the numbers aren't "real" (e.g. their 1.5% stake of $250m is worth $0). I'm sure it's a weird feeling to see the "congrats!" messages! However, the "retention bonus" of $100k over 4 years on top of their salary is usually enough to keep people from burning the place down (being facetious).