I suppose it depends on what you want from the platform. If you simply wish to store your content on the blockchain, then how often you post really doesn't matter. If you are trying to build reputation here, then commenting lots will help your name get some visibility. If you are trying to grow fast, then buy Steem and let its value and interest help you to grow more quickly while at the same time making your vote worth more and so become something that others will try to obtain from you by interacting with you.

I hope that sheds some light for you.