parties as a guy

First, rush is coming up soon. Even if you don't plan on pledging, I would highly suggest you rush a few fraternities so you get to know some brothers and/or potential brothers in the future. That'll be key for entry later. All top tier fraternities won't let you even if you brought a boatload of chicks. Because you're an unknown to the risk chair, and no one knows if you'll cause a scene or not because no one knows who you are. Same goes for most of the middle tier. You may get into some bottom tier fraternity parties with a solid ratio but it's never a given. There's no exact science to it.

Walking in with a group of girls likely won't ever help you, neither will paying any money. They just don't want random dudes in their parties that don't know anybody, because what's the benefit for them then? Your best bet if you don't want to rush for whatever reason is making friends with some guys in various frats (likely lower tier) and trying to have them get you in to parties

Also is there a reason why you're not rushing? Seems like if you want to go to their parties why not just rush anyway if you have the chance