Do the retail Linux numbers mean anything?

“Establishing market share is always difficult in the Linux world. For starters, there’s the issue of installations vs. sales: a single copy of Slackware Linux, for instance, can be installed on an unlimited number of servers and workstations. Secondly, there are a large number of “stealth” copies of Linux sold through bookstores and resellers like LinuxCentral; the bookshelves are creaking with Linux books with a CD or multiple CDs containing a full Linux distro. And polls of users done by internet.com show that corporate users by and large buy Linux directly from distributors, totally eschewing the reseller market.” From LinuxPlanet