Ryan nailed it. People simply like the look & despite all the naysayers, a pad has a negligible effect on the hit. Just think about all those ivory ferrules that hit great - even with a pad!
Regarding patent infringement, pads have been used for decades. I don't see color or opacity as being a reason for exclusivity.
Yes, I could (and have) cut my own from CDs (thanks, Neil) or I could have ordered the cheaper, larger & thicker pads from ebay but I'm lazy. The real reason I had a batch burned in 1/32" thickness was so I could glue the pads to tips ahead of time. When a customer arrives & wants a Triangle with a clear pad, I pick an already padded tip out of my box & glue it on. Wham, bam, done & I'm $5 richer.