I've always had the approach with customers that it depends on a few factors. How attached you are to the bat? How much they were? How much life is left in them (how long before delamination etc). How confident can you be on the fix and finally, whether you can afford a new stick.
If a bat is very well used and is starting to delaminate or crack in various places, it's probably not worth the expense. If they're not, you can expect a decent amount of further use and be fairly confident the fix will hold, then it's worthwhile.
You see a lot being fixed on Instagram which I think should be firewood. If they're that bad, then I'd put the cash towards a new bat personally.
It sounds like you need to open the crack up a bit more on the one you tried to fix. Depending where it is, you may need to remove the handle to open the cracks up enough and then fit a new handle.