I get what they're saying here, but given the fact that the UI is almost an exact ripoff of OSX, it's a little hard to take it seriously. "Give us money for building this OSX ripoff, we deserve it." I agree that people should be paid for their work, but I also have a problem with asking for money for stolen ideas.
I don't argue that its worth more than zero, but let's say the whole OS is worth $50 then what % of the source code is from the elementary team? They deserve their fair share.