I am running a niche message board where people place their ads. I started recently a few months ago. To attract users I placed Google ads with some keywords related to my niche. My budget in Google Ads is $1 per day and I get about 1 quality post per day. Each post/ad is about 5-6 sentences and it can be a picture attached. The problem is that this is a kind of classifieds and the user post only once and usually they don't stick there after this.
Does this approach and cost ($1 per post/ad) look reasonable?
Are you more cost-efficient in your projects?