Why people think Polyamory doesn't work

Having several polyamourous friends, some of whom have posted about it, I thought people might find this interesting:

Strange Ramblings on Polyamory Vaugely Inspired By A Distant Post

“Polyamory doesn’t work,” said my friend. “I’ve just seen too many of those relationships crash and burn. You just can’t make it work.”

The problem with that is, of course, the goal of polyamory. What is it? It’s pretty clear for the other side, but poly’s a little more mutable.

See, as a non-poly guy in a monogamous relationship, I have the luck of not having every sexual interaction I have be the trial for my entire relationship style. When I had, oh, fifty failed relationships before I finally latched onto my lovely wife, I didn’t have to hear about how each of those fifty crash-and-burns were proof that monogamy’s innately substandard.