I own around 10 pronounceable llll.org's, and I've never received an offer on any. The potential price depends upon the potential customer. The high range seems to be around $1,500. If you ran an auction on NP, I doub't you would get more than $20 each.
If an end-user really needs it, they could possibly be willing to pay more. See if you can figure out what they will be using it for. If it's an acronym for their national non-profit, try to judge the size & go from there. If it's a local non-profit, I think the top range would be $500 or lower.
If you find an entity whose acronym corresponds with one of these and they have any interest, $200 is my most received offer amount on .orgs.
Hope that helps.
