I read in a survival manual once that canning lids are a necessary supply if you're into homesteading, survival training and such. And really... if you were gonna learn to put up food in jars so you could survive a rough patch, of course you'd have a stock of canning jars on hand, but who in their right mind would be prepared with a case of fresh canning lids? (shut up, I only have six boxes for just in case).
The only thing is.. when I looked up those reusable lids... they are white plastic and I had a memory of my mother tryin' to make sloppy, messy, strawberry jam and melting canning wax over the top of the jars. Us kids would try to jam a knife through the half inch thick wax and all the bits and pieces of wax would be in the jam... Ewwww... I know. But if I can get past that little memory... I think I'll get some for next year :)