Yeah, from 2.6c (OK 5.2c for two!) to $135 is a bit more than the appreciation of the cars!
I had to put a piece of cloth over the tab before grabbing it with pliers to bend it in place so I wouldn't scratch the pricey parts!!! (that no one will ever see!!!)
And on "Which would lead me to think that it was done for cost savings on sheet metal." It really wouldn't save on initial cost of the sheet, as the were probably punched out during forming, not sure how much "savings" the extra scrap going to recycling was back-in-the-day...