In English, there are many occassions for which subject-auxiliary inversion is used, but one such instance is when you have declarative sentences with restrictive elements or conditions. " The latter is an awkward future-conditional construction, thus, the subject-auxiliary inversion in the example is a cleaner way to say this.
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jooney“The truth is, only if you’re slicing fish for sushi and sashimi eight hours a day is the investment worth it,”The reason for the inversion is only. Inversion occurs in the main clause. You'll find more examples