It's only free if you think that your time and effort isn't worth anything.
Xtol mops the floor with 99% of the home brew developer recipes that keep getting posted here over and over again. If it comes with free learning, it might still be worth the extra time and effort, and maybe some folks actually enjoy playing with photo chemistry in their leisure time.
BTW nowhere did I read that kb3lms plans on never buying Sulfite ever again.
Trying to be the best of whatever I am, even if what I am is no good.