I have been both poly and mono - and get the fuck off your high horse. You know *perfectly well* why people do it, unless you were raised in a polyamorous compound and eschewed all forms of media until this moment.

Some poly people I know have the most crazy fucked-up relationship drama I have ever seen. Monogamy is neither the cause of nor the solution to jealousy, cheating, etc. etc. But it sure does seem that poly people like to show up on comment threads to shake their heads sadly and cluck their tongues.