Your thoughts are always welcome and make good reading though.

Sure, like any weapon, there is a high degree of skill or expertise involved in getting the best out it. Needless to say though, if I have a sword in one hand and an oversized knuckle duster in the other, I am at an advantage compared to the guy who doesn't have one... unless he is using a dagger instead maybe. As the odds are that the other guy is unlikely to possess any more skill than I with anything, then effective use doesn't come into it.
Of course if the other guy does know what he's doing, whether it is with sword, buckler, or dagger and especially with all of them, then I'm in real trouble.
Agreed they are fairly easy to make and some were just solid iron with no wood at all. Whether half a day or a full day to make though, the smith has to be paid for his time and materials, which pretty much sets the price for the item.