It costs $75 for an individual license, not really in the spirit of UNIX
UNIX was created for ATT to sell more telephone service, and then later sold and licensed to other companies to likewise improve their internal computer usage. UNIX was not created to be zero cost. Apparently a commercial license for UNIX cost $20k at the time (or $150 for universities/educational institutions).
edit: IMHO $75 one time is a fair price for a premium font. Designers regularly pay $300 or more for typefaces they use in their work. There are monthly subscriptions to font foundries that cost more too.
It was only much later (and after significant arm twisting for more computing resources) that AT&T took UNIX seriously. Even then, the first marketed versions of UNIX were oriented towards programmers and technical editors, not telecommunication[2].