Try going for a 99 RC level 3. Those are pretty rare, I've never really seen that many since you need Summoning or the Abyss to get fast xp, or magic. But other then that if you're just trying to sell accounts with mid level rc and other skills I'd say $5.00 or so if people want to buy them to bot with.
The wealth would raise the value by around $.60 per million on the account I believe.