LispWorks exists since 1987. Originally developed by Harlequin, a software tools and software applications (Postscript, Lisp, ML, Dylan, ...) company. After Harlequin closed its doors, Globalgraphics bought the remaining assets and employed some staff. They spawned a company. This spawned the current LispWorks company which is a relatively small company dedicated to only the Lisp product.
Initially LispWorks *only* addressed the professional and academic market (for UNIX systems) with the professional edition, enterprise edition, site licenses and special implementations (like the one on NASA's Deep Space One). Over time it got ported to Windows, Mac, Linux, Android, iOS.
A bunch of years ago they have introduced two versions of 'Hobbyist' editions: with delivery and without. This is still expensive, but in reach for dedicated hobbyists (my hobby camera costs like five times of a Hobbyist license).
Meanwhile, mostly only LispWorks and Franz Inc survived in the commercial market for Common Lisp, while all cheaper Lisp offerings (from companies like Expertelligence, Procycon, Corman, Gold Hill, Apple, ... etc.) haven't survived as a commercial and maintained product.
Competitors in similar or more expensive price ranges also went away (Lucid, Symbolics, TI, Xerox, LMI, Ibuki, ...).
Franz and LispWorks must have done something right -> they are still there and publish new releases, while all the other companies (in various price ranges and various target markets) had to give up.