Everyone knows a ghost.

Everyone has that friend or colleague. The one who researches everything before they buy. The one you ask when you want to know which product is worth it, which business to trust, or what to avoid.

To every business they weighed up and didn't choose, they're a ghost. Gone without a word, and holding exactly what that business wishes it knew.

Ghosts gives what they know somewhere to go, and lets them set a price on it.