Thats not many posts though, provided you add something and don't just spam.
I'd imagine sellers might also be wary of somebody with a low post count and look at their history. If you had posted photos for criticism or something it shows you are serious.
There is always eBay, but you have to do your research.
I started off with a low post count, met someone and paid cash. It's no bother.
what is your limit for that lens ??? found a traded in one for £109 on a site i use (not sure if it can be mentioned)