I don’t have a subscription as I would not have enough time to use that much resources, but I have used freebies and made a few purchases too, on occasion, when I needed something specific and could not wait to see if it would be a freebie at some point. I think the subscription would be more suitable for someone using those resources commercially. You can probably get what you need by purchasing them, and it would likely end up less than $19 per month.
I guess it depends on your usage. It would be worth it if you used a lot of them, but if you tend to use the same resources over and over again, you likely don’t need a huge collection.