Ever seen anything like this before?

Way back in 19 and 93 when I used to walk 20 miles uphill in the snow to get to school, I was visiting my grandmother one day when she showed me these bad boys here. It's a book of 50 one dollar bills. My aunt had given these to here to spend whenever she needed a few extra bucks. I thought they were really cool and unique. I had never seen anything like this before and just had to have them so I bought them off of her and have had them put up every since then. Not bad looking to be 25 years old, eh? I told a dealer about them in Canada when I was up there and he was really interested in buying them but I never pushed it. What do you guys think, have you ever seen anything like these before? Do you think they will be worth much more than 50 bucks to a collector? All of the serial numbers run consecutive with each other which I thought was cool. I don't know much about paper money to be honest so any info would be greatly appreciated! @bluelightbandit