Please OFFER AT LEAST one zeta mat each time we do Ship Mat Challenge

My advice to avoid frustration is to consider buying them as the main method of getting them and anything received from the challenges as a bonus.

If you think of the challenges as your main method of acquiring them, you're setting yourself for the constant disappoint and frustrations you're feeling currently because we all go on Zeta dry spells where we go a week or two without getting one.