Well, I had the same question in mind and I read that thread before my last/second batch. Since, I could not feel any feedback/replies from experimentation and believing that could work, I did reuse successfully bottle caps.
I reused two different bottle caps: those that I bought (old new!) and those from the commercial beer bottles !!! I reused only the caps that were:
- flat with only the side/edge bent
- seal in good shape
I limited my bottling to only two different bottle shapes. I did match back caps shape/brand and bottle shape/brand to ensure the best match and seal. I checked each bottle after capping them. Overall it is more management than buying new caps.
How many time a cap can be reuse? That is another question!
I opened about 20 of them up to now and did not get any problem.