Studies show kids prefer Comic Sans for screen reading vs. common serif and sans-serif fonts (namely, Arial, Times, Courier). They prefer it for both appearance and readability: http://t.co/P3ebZjUi
So, if you're designing for kids, these things seem to matter less. Perhaps there's a better alternative not explored (marker felt, etc.) but there are use cases for these typefaces that adults disagree with for technical reasons.