This is a very good approach. Whilst creating content can give you higher % rewards, it is quite a reactive process, you are at the mercy of others to read or resteem your post (I came across this post via a resteem) or if you're lucky enough for it to come up when people search for a tag.

Commenting, especially in a quality manner is more proactive, going out to promote yourself and showing people what you can bring to the community can have surprising effects sometimes.