I cannot see an end use for '000' (if you have identified one then that changes everything). As it is the domain is memorable, safe, a reasonable renewal fee (presuming you have it through isnic.is), safe, etc. Being a numeric it is understood around the world, so perhaps $300 to a reseller who might have a buyer in mind.
(Whilst typing this it struck me that this could be a great financial / political domain, imagine having it as showing the national debts of different countries, the number of unemployed, number of deaths from a war, etc. - just generally something that could be measured in 'thousands' and could have a load of pages easily updated. I have left my initial comments in the first paragraph as the idea put forward here has not been thought through and is just an off the cuff suggestion. But I think to someone who wants to spend the time making such a site the domain is well suited for sub-domaining and therefore could be worth somewhere in the $x,xxx range.)
Good luck with the domain.:D