You may if you feel like paying every person on earth $500 a month to cover their captcha fees. Unless your goal happens to be excluding most of the world from Internet services and random web forums.
I don't know where you got that number from, that's extreme. This is a one-time fee we're talking about here. Also why should I pay anybody? Strange reply.
I think it was a strange way of saying that $1-10 may not be cost-prohibitive to financially-comfortable residents of 1st world countries, but could certainly be cost-prohibitive to users with less financial resources or from 3rd world countries. Such a fee could be a serious deterrent on a free and open internet with diverse participants.
