Because of their (overrated, agreed, let's avoid the point ) good reputation on the net between 2004 and 2006, and also because many people still think of "Ritek" mainly as a brand. This CDFreaks community is a microcosm that would lead us to think that Ritek has lost its reputation, which is sadly not the case. You can still find forums where users are raving about "yeah, these discs have the G05 dye ( :rolleyes: ) which is GREEAAAAT" and other appalling nonsense LOL.
The brand itself has been heavily copied and still is (Itek, Titek, Ridisc's logo, Rivision's logo etc..).
I don't think Prodisc, on the other hand, has any reputation at all (good or bad) in the general public. Maybe the name itself (as it includes "Pro" in it :rolleyes: ) could motivate couterfeits, but I doubt it, as faking a MID (apart from using a write strategy) is interesting only if the name has a wide reputation, like MCC, TY, and (sadly) Ritek.