Drug dealers make some of the best apps.

Heard of Farmville or World of Warcraft?

WoW even borrows the first-hit-is-free, by encouraging each purchaser to share the software with their friends. The entire universe of WoW is a streamlined treadmill, for keeping players addicted. From depreciating gear, inflation, achievements, status symbols... it has it all.

Tongue-in-cheek, I know. But I can see how combining the drug dealing experience with video games could lead to insights such as Blizzard and WoW.