Tracey.. Sorry to hear about uR luck. Yes in ur case buying is the way to go..
They can be very smart. Mine have been good. Maybe just lucky. But i check daily for chew marks.
Ft has the convinence factor.. Buy bulk.. Keep bulk.. I used to feed only live until one week my petstore was out of ft and live.. And my snake had to wait. Not horrible but not good. So i switched to ft. Even raising my own i will be culling and freezing most of what i produce. A snake on ft mice rats or asf in my opinion is more valuable.. Slightly. Ill pick a ft eater over a live eater any day.
But if ur in a situation where your feeding tons of snakes. I know most of the big breeders go away from the caresheeys and just throw them in. And walk away.. And then come back in a bit and take out the uneaten ones.. Thus no waste like you will have with ft and picky eaters.