Exactly, it's like you having a "bring your own booze party", lots of friends/family will turn up with quality wine/ale/cider/shorts etc,etc,etc.
Then you get the 8 arseholes who turn up pi$$ed, with 8 cans of Fosters, which the pinched from the garage shop on the corner and then they proceed to guzzle every drop of booze in the house.
If you can't afford the party, DON'T JOIN IN. !