I see your point, but the fact is those coupons, unless distrubuted online, are not meant to be distrubuted digitally. Scanning them and allowing people to print them weren't the intended use of the coupon. If you really wanted to put them up "just for people to see what they look like" the poster can always paint over the barcode. The $5 off PSU Best Buy coupon was put online, then photoshopped to be easier to read / not so grainy and then a new scan was put up... Best Buy never intended for that to happen.
If stores should police themselves over coupons, then they should likewise police themselves over glitches, because only dumb cashiers give away $50 games for free when bought with a $3 game.
I'll put it down right now though that, like I said earlier, I'll use any coupon put on here (if its legit) and take part in any deal if it benefits me, I'm just pointing out some double standards.
Roufuss> OMFG I GOT LIKE $8,493 IN FREE PC GAMES LAST WEEK

But I do think he has a point. I don't see why digital distribution of a coupon is ok.