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Basically, the only people that read FR novels are well, FR players (and Salvatore fans I must admit) whereas I've known many a DL novel fan who has never played a D&D game or hasn't played in several years.
Am I off my gourd in believing this?
Not off your guard, but certainly incorrect.

If FR stopped being a gaming property tomorrow, and focused solely on novels, it would continue to be massively successful. FR has a huge novel audience that has nothing to do with FR as a game setting.
I can't quote numbers to compare FR to Dragonlance. But it certainly wouldn't surprise me to learn that FR is more well known outside gaming circles.