I've never reused lids but I don't throw them away either. I have a box for used wide mouth and one for regular. Just in case a time comes when new ones are not readily available.
I'm going to talk to a couple friends and see if they want to go together and make a large purchase.
We order them by the case. If lids have a little age we just boil them longer before using them. Might work to re-use them also. If you're out of lids and can't get more I would boil them longer and try re-using them. If some of them don't seal just try again with another lid or eat the contents immediately. They'll either work (and seal) or they won't. Either way you'll know right away.
I have never heard of this product, say's they've been around since the 70's...We will be getting some!
As for the old lids, they make great covers for knot holes that allow mice to get in...targets on a stump !! haah... and they serve well for just being a lid on something that don't need to be sealed... like pickle jars full of sugar etc...I used 2 together one time for a large washer...it worked...