Windows NT itself comes in two editions, NT Workstation and NT Server. To get the complete package you have to buy NT Server, which is priced too high for most home users. Another source of new Linux users is generational. On the technical front, today's young rebel, having been raised on computers, is not going to be intimidated by a Unix shell prompt. Of course, there's also the affordability factor.
Many young rebels are short on cash.
Most of the new Linux activity appears to be with individual users and not businesses. Engineering and scientific applications of Linux are already well established. For pure business use there's a hype-based NT frenzy going on at the moment, and it's hard for Linux to get a word in edgewise. No matter, Linux can wait. It's not going away and it's only going to get better in the meantime.