I don't worry about things like post count. I tune for the fun of tuning, not to have a huge e-penis.
But it helps to have an organised first post, that way people can see immediately what tunes are valid for current events and which ones are not. I also have indications telling which tunes I value most and which tunes others value most (reviews/feedback). This helps people decide which one to pick when they are not sure what they are looking for exactly.
Also, since I mention the specific PP and track in each tune I post, this makes it easy for people to find them in search engines.
And last, but most certainly not least: I focus on driveability, which means my tunes are valid for a large audience, not just the hardcore racing sim buffs out there.