Yep, given that implementing Forth is so easy (easier even than implementing Lisp) pretty soon nearly every Forth programmer decides to take their turn doing it themselves.
Which reminds me that its time to dust off my old FORTH and make a proper calculator out of it.
I suspect, for many, that implementing a forth is more interesting than using a forth.
Once you start writing really complex programs the system gets painful and hard. But trivial things are easy, and the consistency is so appealing.