Just because someone posts an add doesn't mean they are gonna sell anything. Reputation counts for alot. There is no rule for posting an add your first day BUT if you take advantage of the situation you will be penalized. For example people have been thrown off this site for abusing the picture forum to promote animals for sale. You are only allowed so many ads. I think the more established you are on this site the more respect your ad will get by fellow members and that comes from contribution. I think it also says alot about the person and their genuine concern for the animals and people that buy them.