From my point, I'm okay with that idea since your motive's only to promote your fic^^. We(readers) r here because we want to read some fics, ryt? You just suggest them to read yours not insist. If the wall owners don't like it they could just ignore it tbh..
Actually I always check on every fic advertisements in my wall except roleplay lol

No it's not annoying to me. I appreciate that people take the time to search for people who are interested and promote their story that way, I find them very admirable - as not many people do this.
Anyways good luck ^^

Tbh, I never look at the advertisements. I just find them plain annoying. I had one ad that didn't even make much sense, once :/
But, I'm sure a few people read them :)

It works pretty decently

hoenstly? depending on how i feel. im happy with fanfics, but with roleplays, i feel like killing myself..