Since the price you're trying to sell it for is "too good to be true", you should probably reconsider that part and list your domain name so we could check if it belongs to those that actually purchased the previous version of bustabit or it's among the fraudulent sites? If it checks out, then buyers would probably ask for proof that the domain is under your control, prior to proceeding to the next step which is the actual deal with the involvement of the escrow provider.