Slippery slopes are also based on observation. Rival company buys some stock but says they aren't buying the whole company. Then a few years later they buy the whole company. Company let's employees dress business casual on Fridays. Then Friday becomes jeans day. Then employees go business casual everyday. [spoiler]this kind of slippery slope is awesome[/spoiler] Call of Duty sells gun skins. Then they sell requisition packs. Then they sell requisition packs with the best gun in the game. The slippery slope is not a fantasy concocted by crack pots. It happens . . . [spoiler]if you let it.[/spoiler]