A personal preference may be an indicative, and may not. Masses preferences
are so difficult to pronosticate, that if not, many people could take
advantage of this fact, and it is not the reality. There are many factors
of influence, marketing is not always the clever, and statistics is not
always helpful. My personal preferences differ from yours, and surely from
others, I don´t like Chessgi too much, and although I like Crazyhouse, I
don´t think this game has enough elements of attractive for the grand
mass. But guessing is a good mental exercise, undoubtely. And, who knows?,
can you kill, with strong arguments, the possibility of a Symmetrical game
of the collection as the FIDE-Chess substitute?. I can´t, a priori,
regardless my personal opinion. I prefer Maxima, of course, but this
preference is clearly biased.