So, if I had answeared a closed question(before it is closed) the best thing i could to, in order to benefict the question owner, should be deleting the answear to his question?

Im not talking about any specific question, but I saw a lot of people that posts a low-quality question and get -10 downvotes without even having the possibility to delete it own post. I would like to create this post on meta to discuss about it and to know if there are moderators/administrators reasons to do it.

Nice, thanks for your revealing response.

I forgot to tell that I didint find any ads on any stackexchange forums as well...

Which ones can a user get more than 1 time?

If you delete them maybe new ones with the same content will apear. I think they would be as they are, posted.