Yeah, time to buy more peg board I guess, because I certainly don't seem to be stopping with the sword buying... in fact I already need more space so I can store my kaskaras and Takouba outside of their scabbards. The chemicals they use to tan the leather are bad for the steel, plus they collect moisture that causes rust.
My understanding of the back-curve of sabers is they are designed never to stick in the target when you swing at someone from horseback, since a stuck blade would either be pulled out of your hand or would pull you off your horse.
They've been arguing for hundreds of years over curved vs straight sabers, both have benefits and weaknesses. Like you mentioned, a curved sword won't get stuck in your enemy. It also causes nastier wounds. But a straight sword requires less training to use and allows you to apply the speed of your horse to the blow.
The main advantage of a straight sword is that it's scarier. Cavalry charges only work if the infantry they're charging at panic and break formation. If they stay put or manage to build some fortifications, most horses will stop rather than charge through. They found a horseman charging at you swinging a curved saber was less scary than a horseman charging with a straight sword pointed at your face. It didn't matter which one was more effective at killing you, only which one was more effective at making you crap your pants and run for the hills.
So since straight swords are better for charging but curved are better for skirmishes and cavalry-on-cavalry melees (although that's debatable too) many armies tried to make a sword curved enough to swing but straight enough to stab. Or they'd give their heavy cavalry a straight sword and the light cavalry a curved one. But if you look at some of the final "made for actual use and not just dress" cavalry swords from the early 1900, many of them are straight. The US 1918 cavalry sword designed by George Patton is basically just a straight pointy rod with no cutting edge at all.
The history of cavalry charges and swords in general for the past 300 or so years is very strange. Once infantry had rifles they could mow a charging cavalry down before it even got close. It seems like they kept doing them past the mid 1800's purely out of military tradition. Every once in a blue moon a charge would suceed because conditions were perfect, and that was enough to convince military leadership to keep doing them.
Edit: I should add this is a western european perspective. They seemed to keep making cavalry charges work in eastern europe up until wwII.
I guess the question I should have asked about the moroccan blades isn't why they're so curved, it's how they're so curved. If they're made from old European sabers, where did they find such curvy ones? Or did they bang a little more curve to them when they were "converting" them?