The club I belong to is the same way. The bar lets us get away with bringing in homebrew, but if they were bottles of commericial beer, that could be a problem. The best way to keep the bar happy is to buy a beer two from their selection and/or order something to eat.
I could see there being a problem in a large and popular club like the WHALES, but in our small group you only bring if it if you have it. Personally, I don't care if someone doesn't bring any homebrew. I just like to share my beer and see what club members think of it. But, there are limits. If the only reason someone was there was for free beer and had nothing to contribute, that would be a different story.