The nominal charge language was inspired by GPL's similar language[1],
and it was intended to be read as a limitation on "reasonable means".
In other words, we wanted to ensure that the "reasonable means" was
not "oh, it's totally reasonable - you just pay me $1,000" - it is
supposed to set an upper bound and reinforce the "reasonable"
requirement, not imply that a nominal charge is always OK.
Luis
[1] In GPL 2, "for a charge no more than your cost of physically
performing source distribution"; in GPL 3 "for a price no more than
your reasonable cost of physically performing this conveying of
source".