If you are a domainer, you want to make as much money as possible when selling a domain.
One way to do it, is simply to not do anything and wait for people to contact you.
After all, if they contact you to buy a domain you own, while you have not done anything to publicise the fact you are willing to sell, it means they are highly motivated. And highly motivated buyers mean that they are more than likely to pay top dollar for the name.
If you want to sell high, keep your profile low.