I would suggest that the model works like this:
1. The bar wants its own brand craft beer - out of vanity or whatever and may therefore pay a subsidy to introduce the beer to the G/H/B drinkers
2. Said drinkers get to realise that there is life out there other than G/H/B and may want to try other beers <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt="

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3. Maybe bar then trys another different style of craft beer
4. Said drinkers realise that there are [u:2a5gmk85]different styles [/u:2a5gmk85]of beer available.
5. Bar then stocks the greater range of ICBs under their own name/brand
Just my take on this
Cheers
Will