My "friends glitch" theory and I am right ;) and I say that because I am American ;)
This is incorrect. Visiting a town that is currently being affected by Lisa's quest will cause you to lose 5 snakes ( more if there's more then one lisa doing it ). The reason you are noticing a corolation between premium content and lose of snakes is that when you assign Lisa to this task, the players with the highest number of snakes are often being targeted. And they have a higher number of snakes because they purchased premium content.
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