I haven't tried reusing a bag, but I once sucked up a screw which flew into the bag (of my CT Mini) & pierced it. I taped it up.
Unfortunately the tape didn't hold for long, and weeks later when the vac made strange noises I opened it up to find a hell of a mess inside. Took about an hour to clean it all out - it didn't help that I didn't have access to a second vac to clean up the mess. That put me off ever trying to empty & reuse the bags - it's just not worth the saving for the risk of the tape failing.
Recently however, I was down to my last bag and did some planing which filled the bag very quickly. I had no other option but to try & re-use it, so I pulled the shavings out through the inlet hole. That worked quite well, but for me doing that with anything other than long shavings is not an option. That bag is still in the machine.
I've just bought a box of 20 bags here in the UK for GBP32.95, which seems to be quite a good price. That works out at just under GBP1.65 each (about USD2.75). With the rate I get through bags, that should last me a couple of years so I see no need to try & re-use any.
If you're happy re-using your bags, then great. But I won't be - it's just too much effort (and risk) for such a small reward.