It's about time we had this discussion

[Nielsio]

It's a style issue. You can vary them if it suits the table and if you can adjust to it; because it changes villains' calling range and also the range you're put on (mixing that up is a form of deception you need to handle as well).

My own style is to avoid marginal situations. So I'm much tighter than you guys oop, which is why I need to raise my sc's/pp's the same amount as I do my good hands. Sometimes I'll only raise to 3bb though because it accomplishes the same and I can decide postflop to play a bigger or smaller pot.