What makes you think a government or non profit organisation would pay so little?
QUOTE]
If a government really wants your domain, they could take it using emminent domain. They would then pay you "fair market value" (ie whatever the low-end appraisal is).
Most nonprofits do not have lots of descretionary money to spend on domain names. I agree the domains will be worth more in the future. I also agree you should hold onto them and develop them. As someone else said, you may even get x,xxx for the domains someday.