If "worth" is a preposition then its object is logically "what" (meaning "the amount of money (that)"). Whether or not it is a preposition is a matter of debate. It is quite a tricky word to classify.
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JigneshbharatiYou should be paid what your labor is worth.The preposition is often placed at the end of subordinate clauses.
AlpheccaStarsYou should tell me what you dream about. (About what do you dream?)By analogy, "Worth what is your labour?" is quite a stretch for me.
GPYBy analogy, "Worth what is your labour?" is quite a stretch for me.But " worth 15 £ per hour" (its value) is not.