Why does slam poetry all sound the same?

[Dymun Fengshui]

This is a serious question. 

I like slam poetry as much as the next girl (speaking general populous here, not PigPenners), but get confused sometimes. Are the random youtubes of slam poets I run across all really the same person and I just forgot how he/she looked or even if he was a she or she was a he? Because not only are the styles of the poems invariably super similar, but everyone seems to have gone to the same class entitled "How to Deliver your Poem Orally (Note there is Only One Way)" by Professor Earnest "Breathless" Speeder.

Here's the video that sparked the question. It's a touching look at depression but it'd be more effective if she hadn't taken that class.

I LOVE this video, I love her work of words. I am unsure what is not to love. maybe it just isn't for you. Not all poetry is.