Your 6 month delay on parking payments is a joke - but understandable because you park via another 3rd party.
However as I am sure you know Google now provide domain parking accounts to everyone - so really you have no excuse not to improve this. I even have one myself. The only feature I like with your parking is the for sale link.
Plus .. you are missing out on revenue because frankly your current parking system is not used by most domainers I know.