AndyBaker

The reason most websites aren't for sale, is because they're not for sale.

But that aside...

How could you stop people "bidding" $100m for their own site?

Anyone with capital, why would they waste their time putting fake bids down? If they're genuinely interested in a site - they'd approach the owner privately.

What is the value of this, beyond "ooo look how much this site is worth"? Don't you just become another flawed website value calculator?

Just some ideas.

This is moving move towards a distraction and something you probably shouldn't do. However it's hilarious when you pull it off, so...

Cloak their IP and a 10 mile radius. Show them a new homepage saying you've got fabulous new features in the works. Think up a series of completely useless features that would drive people away, but frame them as plausible. Back it up with facts and figures from "in-depth" user studies you've done.

Then watch them try and beat you to develop the features.

It worked for me in the past.

If other bookmarks were saved say 3 hours either side, show them in a slider style.

Granted, not every bookmark will be "next to" others, but it many cases this would give a good sense of context.

"Hmmmm a page on Google analytics... I wonder why I saved that.... oh yeah! That was just after bookmarking this page about 'Best tracking systems for WP blogs'"

Once it's free - I'll bet you drink 2x as much.