It's worth it if you already know that you like kayak fishing.
I constantly see kayaks for sale where the owner only used it a few times. If you buy used you will not lose much if you decide you don't like the sport. Pedals won't automatically help you catch more fish.
It also depends in what type of fishing you do. If you stick to harbors it might not be worth it. When you want to cover distance in the open ocean it's hard to beat leg power and the mirage drive with upper body and a paddle.
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-Beto
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