I suspect around 80% or more (the loot w****s) will only do LFR in that case. Well, I guess the achievement hoarders will be obsessed with the points, so I guess I could add a condition: provided there are no achievements or we are only talking about raiding+loot.
If you say "what a stupid question is this, of course only lfr", don't worry, it's not a stupid question, you're just one of those people that does not want to raid really, you mainly want loot and maybe a bit of raiding. Or you do want to raid but you do not want to raid with a guild, but for personal fun, which, to be honest, is something I greatly respect, sometimes it's more fun to optimize yourself than bear with others in the game.