I too feed live out of convenience. Most of my snakes are still young and not yet full grown. It's more difficult to order f/t because all of my snakes eat different sized food and I feel like a lot of those f/t rodents would go to waste.

Also, I recently started breeding my own rats. It's just easier to throw a rat into a tub than thaw out and do the zombie rat dance.

And I also feed live rats to my ferrets. It is 120% more healthy for them than eating commercial food (even the high quality brands). Feeding live provides enrichment and exercise for my ferrets when they hunt and take down rats.