From the article:
> I am following up our conversation a few months ago. KP would like to sell our ownership back to Gumroad for $1. Can we discuss this week?
> Mike had left KPCB to start a new company, and KPCB didn’t want the operational headache of appointing a new board member. Plus, it helped their taxes.
> One investor joined them. We’ve bought back a couple more, since then. I keep the rest of the investors up-to-date with a brief email every few months.
In the case of the Gumroad guy, this is exactly what he did/ He basically let VCs choose when they took their losses once they realized Gumroad wasn't going to be the next Facebook. They used the losses to offset some huge wins they got on other investments. The VC walks away happy because he exchanged otherwise useless stock to increase his returns on something else he sold that he did really good on. The owner of Gumroad walks away happy because he gets his company back. Win-win for everyone.
That stake was likely worth hundreds of thousands if not millions of dollars, but to KPCB it wasn't worth the hassle to find someone willing to pay that. They know they make a loss on most of their investments.
The purchaser collects a service fee and a lottery ticket for the random "XYZ Inc sold patent to IBM for $10 million during company liquidation."
The buyer isn't buying for tax offsets. They're buying at deep discounts because they're often the only bidder and the hope that they occasionally find themselves taking on some asset for which the sellers have vastly underestimated the value (such as some obscure patent).
Delicious was bought back from Yahoo, in fact that happened a few times with companies that Yahoo bought and spun off again.