Lanefan
Victoria Rules
Some do (or at least try to!); there's two such groups I can quickly think of:True, but magic players don't read the rules for the sake of reading.
Casual or casual-ish players who really want to see how the game works beyond their own cards and-or experiences
Hard-core players doing research around possible exploits or loopholes.
I was once in the former group, when the full rules were about 1/3 the length they are today, and I still couldn't get through 'em all.
