Bloody hell, today got 4 firewalkers + 2 useless ageless might belt.

Funny. Sold in 5 minutes a crappy low armored pants (150+ Vit, 40+ AR) with 2 sockets for 1.5mil. Bonus is has +7 pickup radius.
Is it really worth that much?

Same here. Been getting weirdo legs.
Looks interesting and sounds interesting but cannot sell one

Found a Stone of Jordan today. Just when I got 5 stacks. Pity it's for barb.

He means if your item rolls two affixes with say +Dex, then they'll combined to become higher (total) +Dex. Does happen e.g. if one of the +Dex is a legendary's attribute, while the other is a random magical properties.

I thought the established thought is MF gives higher chance of rolling a higher class item. E.g. highest is legen, then rare with 6 affix, rare with 5 affix, and so on till junk. At least in my experience higher MF give much higher chance of getting rares, and legen. You know that when multiple rares starts dropping out of normal mobs.
The only wild card is the bonus item.

I think your math is not correct la. Look at it this way, total drops of everything is 100%.
If for e.g. legendary drop is 1% (probably much lower in reality), then the rest must fit into 99%. Now if legendary drop is double to 2%, then there's only 98% left which must be shared by the rest so something MUST now drop less.
How they adjust the ratio of the rest is up to Blizzy, but I'd assume they will reduce everything slightly so as to maintain the ratio of everything except legendary, and add the surplus into legendary roll.
But ok all pure guesstimation only, not gonna do crazy statistic collection stunt

Keep for trophy