Both of your prices are WAY off. That account is worth like $25-$30. $100 is way overpriced, considering that 99 attack and cooking isn't to hard to get.
I only can think of one thing you could really do with that domain (hacking wise)
Set it up as kind of a rs clan for pking, and make it so they have to enter email, password, runescape name, etc, as most runescapers use the same password for everything.