[EverythingEverywhere]

I have been harsh on Entercard in the past (read their forums) but I do find some value in it.

It is great for launching a new site. It is great for getting exposure to other bloggers. You will get some readers, but only a fraction of the total traffic it generates.

The bigger your blog grows, the less sense it makes to spend time dropping cards.

If I were launching a new blog, I'd drop 300 cards for maybe 2 weeks, then start winding that down and shifting my time to other traffic building efforts. If you don't, you are just exposing yourself to the same people over and over. Most of that can be achieved in the first two weeks you are in the system.