People who want Mint installed on a computer are people who are either 1)
unaware that proprietary software controls them or 2) not considering their
freedoms as important (which is sad from my point of view).
In the first case, by buying a computer at ThinkPenguin, the user can easily
switch to a 100% free GNU/Linux system (what makes THinkPenguin *unique*
today). In the second case, that brings ThinkPenguin money to sustain its
free software activity (in particular this selection of freedom-friendly
hardware).
In both cases, the two users can buy hardware for Mint elsewhere (for
instance at CompuLab, which pre-installs this GNU/Linux distribution). That
would be worse for freedom lovers who really needs a company like Chris' to
easily buy devices/computers that are guaranteed to work with Linux-libre.
Non-free software is bad and I am sure Chris will never say the opposite.
Selling freedom-friendly hardware, including to users who want a "dirty"
GNU/Linux system, is good. Stallman uses a Lemote laptop and Lemote is not
only pre-installing 100% free systems. Actually, I do not even know if they
propose them!
Like other users of this forum have pointed, your trolls about the lack of
freedom of the GNU licenses/ThinkPenguin/etc. are ridiculous when, at the
same time, most of posts are about promoting or defending proprietary
software. You should try to compete with other trolls for a prize. Since you
are the one troll in this community, please go away trolling with people of
your "level".