Does any of the traffic convert to $$? Its not really enough traffic for a typo, as this is where the value of a typo is really held. If the domain makes enough money in a year to cover the reg fee it is worth keeping, if not, ditch it. The only way this domain will get more value is if the real site 'ringtones.com' builds up its size and traffic as then yours should increase too.
Without revenue this domain has no real value i'm afraid.