I think they underestimated the number of niche markets.
1. Students
2. Programmers
3. University professors/staff (I know one guy getting one to review grant proposals)
4. Legal staff
5. Medical staff
6. Gamers (D&D, D20, etc)
7. People who are always going to use the largest font sizes.
Basically anyone who reads a great deal of fat documents, industry-related periodicals, or other huge piles of paper who can get PDF versions or Kindle versions instead. Like I said, I know one person who wants it for grant proposals, I know a few medical people who would be highly interested if their field related periodicals start coming out in PDF/Kindle format. My husband wants one for programming books and gaming stuff. His youngest sister starts college in the fall, and we will be watching for textbook availability and prices.
I will always use a K2, but I will like the option of stealing my husband's DX once we order it.
Lara Amber