Because the Hollywood Chamber of Commerce controls who gets a star...and surprise, it's about money...
....A fee of $40,000 (as of 2018), payable at time of selection, is collected to pay for the creation and installation of the star, as well as general maintenance of the Walk of Fame. The fee is usually paid by the nominating organization, which may be a fan club, or a film studio, record company, broadcaster, or other sponsor involved with the prospective honoree...."
The Hollywood Chamber of Commerce approves 200 stars per year...200 x $40,000, ka-ching!!
I see. Interesting fact I did not know, thanks.