Your other thread selling the 2 character .net is an indication for the value of the 1n.net here - I would say $1500 at least for that one , another $1000 maye for the 0i.net!
I don't see a lot of obvious development potential, but the sheer rarity of these type of names drive up their value. Perhaps low $X,XXX for the pair [0i.net 0i.org] wholesale.