After far too many problems with EA related products and services I've made a personal rule that if they won't put it on Steam, then its definitely not worth my money obviously.
Also, I kind of promised myself I'd shoot myself in the head before buying another EA backed game after Mass Effect 3....so, yeah, Humble, good, magnanimous, beneficent, saintly....whatever its called, if its locked behind Origin...they can keep that crap, including the thousand dollars worth of games I already lost to my personal vow to avoid having to commit honor bound hare-kari over easily avoided mistakes.
Whats more, charity or not....EA is writing that off on their taxes, its not as if they're actually being charitable other than to look charitable publicly. So I don't much buy the whole "its for charity" thing. EA has far too many accountants and lawyers to have any soul left in it. Its a nice puppet show though...for people that enjoy puppet shows.