No-one is but I see where the frustration is coming from. A stretch goal that only benefits big spenders is likely to piss off those who aren't.
I think it would of been better to have free orbs as, For each $100 spent you get X free orbs up to a max of X orbs. That way it includes the majority of those funding the campaign. That being said, I think plenty is being given out at all levels even before the orbs were introduced.