What is it with people selling cars?

[JAJH]

Taken from the Qld Transport site:

"If you are selling a registered vehicle, you will need to obtain and display a Queensland safety certificate from the moment you offer the vehicle for sale. The safety certificate must be displayed on a conspicuous part of the vehicle. Contact an approved inspection station to arrange an inspection. Fees for inspections are paid directly to the station. A seller's checklist is available.
If you fail to display a Queensland safety certificate on the vehicle from the moment you offer it for sale you may receive an on-the-spot fine of $550.

Note: You are required to obtain and display a safety certificate on a registered vehicle when it is being offered for sale, even if you plan on cancelling the registration when the vehicle is sold."

Now, whilst I understand the need to have a Safety Certificate when advertising a car for sale, I cannot for the life of me understand the logic of going to the expense of obtaining a Safety Certificate if you are intending to cancel the rego once the vehicle is sold. It doesn't make one bit of sense to me, unless I am missing something and one of you guys can explain it to me??