That was an old Masterpull trick. At one point they advertised their 3/8" line as being stronger than anyone else's in similar fiber and braid. They were using 10mm and selling it as 3/8".
My cost, hard cost with zero profit is right at 45 bucks for the thimbles. Add 18 bucks for shipping and we aren't making much on the lines. If there were more room, I wouldn't have to charge extra for the drum loop. But, the recovery gear isn't about making money. It is about supplying good quality, high utility gear at a tolerable price point. My products are not aimed at those that collect bumper jewelry, they are for those that use it, know they will wear it out and it needs to be cost effective enough that it can be replaced without feeling too badly over what you are spending.
The Amazon folks make it tough. I've got a ton of normal fairleads that I have more cost in that you can buy one on Amazon for. I need to figure out a way to move them. I may just start giving them away with a rope purchase since that appeals to me more than just throwing them away.