I think, from Mascon's POV, that if you are making things repeatedly and using card stock templates, once you get the hang of using bump jigs you can reduce variation and improve your overall quality. It does suck that he is selling such mundane items for such premium money, but that is why I don't have his brand...
From Corter's perspective, if you have been using card stock templates and are as good with cutting out with an exacto knife, why waste the effort in time and expense fiddling with bump jigs. After all, his statement about how the leather is going to morph once you stick some cards in it and start carrying it (wallets, specifically but applies to most items too) so being exact to the point of using hundred dollar bump jigs just seems like a luxury.
My most sincere hope is that they don't start wallowing in the mud and things get all dramatic. I enjoy both of their channels and have learned a ton from both. I really don't want a "bump jig" rift to form between two crafters I really appreciate.
Mascon & ZeeBee's leather ruler has my interest piqued, not gonna lie. So. Much. Money. though...