I am not saying provide it for free. Because marketing a free and paid app requires the same amount of effort.

Here are my thoughts when I tried marketing MockupTiger to all the websites. It summarizes the exact thoughts https://plus.google.com/u/0/103713120145925411926/posts/G5nW...

But, for $10/month you are not providing any value yet.

First build value and then charge. Start free but with the intention that one day you will charge.