v5cars

If it doesn't take much/any time out of your day, why not advertise, if only one sale comes from the advertising surely its worth it. If it costs nothing (including time) then why not add to the exposure of your brand on the internet, it will do nothing but good for you and your own dealer website.

Hatchback for me

Wouldn't covering warrenty issues yourself also create a nice aftersales relationship with your customers, further heightening your reputation.