Jay,
I've been in OBC for 26 years. We basically mail each other cards to help complete sets. Generally cards are lower grade and from the 50-70s. We post wantlists and then just send cards to each other - RAOKs (Random Acts of Kindness). I would guess I send and receive about 100 envelopes a year (200 total), 95% which are PWE (anything less than ten cards is typically sent PWE). So I've been responsible for over 5000 PWEs in that time. There's about 150 of us in the group. That's a lot of PWEs, and almost all with a single forever stamp.
I did run into a similar issue when I moved to a new town five years ago, I had about 5-6 PWEs returned saying I needed like $3.50 postage. I asked my mailman about it and he shrugged and said mail it again, I did without issue. A few times when I went to the counter they gave me an upcharge so I always mail PWE without issue through the mailbox. I do typically use a card saver as opposed to semi-rigid. But I have often used semi-rigids without issue.
Bob
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