It's popular, just a shadow of Nintendo in popularity is all, but it's their own fault entirely. eBay has always been the great barometer of popularity I have seen with games, just see what they sell for. Sega back in the 90s had a huge one hit wonder with the Genesis, but they burned many fans and a lot of bridges with the 32X, SCD and even the Saturn. High priced items, little quality or little output(32X) for it and people got screwed. Peoples memories even if they're not sharp, they remember feelings easier and I think that plays well into popularity and less people just care for Sega. Compound the issue the existing company does a lot of dumb stuff and is a sad shell of itself that also produces no hardware, and the situation just is what it is. If you stayed a Sega fan or found you do like their stuff you buy it, but far fewer do and the prices reflect it versus Nintendo stuff. It is a good thing though, you can get a lot of nice stuff and not pay that much because you don't have resellers in mass trying to rape your wallet.