Here's why that matters: Most VCs will NEVER EVER SEE THE 20%.
Most VCs suck, and they don't have any good exits, or often any exits at all. So they know they'll never get the 20%.
Therefore, being rational optimizers, they try to suck that 2% dry by creating new funds (for their firm) and new funding rounds (for their investments). The investment is always just about to get big, we just need another round for more runway!
HN tends to focus on the like 5 VC firms that make money as opposed to the 995 that don't. All kinds of shady stuff happens to these investments on life support, like kicking back money to the VC, paying for "business" travel for the VC, yadda yadda. The founders have no incentive at all to talk about it, since they need to get money for the next idea and it's all a reputation thing.