Yea I agree most people that are really into messing around and getting creative with ID options are likely posting their designs and finished products online to share.
Regardless even if you copied a design and somehow ran into someone wearing the same exact IDs is it really that much...
If you like a design enough to drop near $200 on, doesn't matter if you designed it yourself, used an existing shoe as inspiration, or straight copied another design you saw online. The chances your design is unique are slim to none. I'm sure there are plenty of people designing and buying IDs...