Am I Getting Underpaid At My Agency?

So, I’ve been working with a marketing agency for the past few months doing pretty consistent full time work. Since it was a pretty new company, its been somewhat sloppy and a work in progress, but we’ve been bringing in bigger and bigger clients, so i cant really complain.

However, my clients have pointed out that they think my pay vs what goes to the agency is rather low. The deal we have worked out now is I take 33% of whatever the client pays each week.

Is this low, average, or what?

Keep in mind I do ALL of my work, literally all. The only time the agency has any interaction is to ask if they’ve paid yet and that’s about it.