My reasons for raising PF is due to these factors:
-I like to controll the large pots, forcing the button out makes it easier to take a free card at some point if needed. Getting a free card in a big pot is very nice. So the main reason why I would raise a hand that doesnt do well multiway is position.
-Also being seen as an aggressor in this pot makes you more likely to be able to control the field.

This all evolves around button being a player that doesnt call raises in big multiway pots pf.