[ QUOTE ]
anyone raises big preflop?

[/ QUOTE ]

You could, generally I wouldn't, it depends on the situation. It's mostly a feel thing.

If you did raise it preflop you could feel more comfortable about tossing out a bet on the flop.

It's common for people to limp-in with small/mid pp's for set value, but then they make a mistake by getting crazy with them when they miss theer set on what they see as a 'favorable' flop. Someone could have limped with anything so you have to be careful, especially OOP. Generally if I limp a mid PP OOP in a multiway and I don't hit my set then I dump it. When you have position, or have raised it preflop you may have some more options. It's all based on feel though.