Rational, or economical? I find it rational to help someone in need since I'd want others to do the same to me, even if it's not financially profitable for me. Imo more factors flow into what's rational, but I understand what you mean by corporate greed working this way (less than 10% of people are blind, neither male nor female, run a free operating system or can't afford a new computer, etc., so yep they're not profitable groups and for-profits don't optimise for that)