From my perspective, yes it's worth reloading shotshells, especially if you're a high volume shooter. I just carefully had a peek at my costs, "taxes-in" with
buying bulk supplies of wads, primers & powder. I'm currently at about $ 8
a flat less than the cheapest "promo" loads (which I don't like) today.
That's not a whole lot of savings ( 80 cents a box) , but coming off a PW 950 Elite I've owned for about 10 years, and sitting on 20-30,000 once fired old style 12 ga. AA's, it's definitely worth it to me ... I get very good quality, dependable reloads, just the way I want them, ... when I want them, for a fair bit less than first rate factory stuff costs. Savings for 20 gauge is comparable ... and again, I'm in good shape with about 5000 once fired AA's. As CB & others note, it's considerably more attractive if you have a 10, 16, 28or .410, or need 2" or 2-1/2 shells for an old double.
I find reloading both relaxing & enjoyable.
In the end run, "is reloading worth it" ... maybe ... depends what you're looking for, and what you want to get out of it !