There shouldn't be any difference. I have heard the commercial guys will go about 20 generations then pitch new, but they are turning those generations over in a much shorter timeframe than we usually can.
EDIT: By "generations" I mean batches.
Something is always fermenting
...."It's Bahl Hornin'"Primary: Brite Tank/Lagering:
Cider, German Pils, Belgian Tripel, Bedeviled (Bel. Golden Strong), AHA Summer Ale, Sonoma County Organic Cider, Maibock Bock, Ommegang Abbey Ale CloneBottled:
Contentment (Trappist), Derangement (Belgian Dark Strong), Kranky (Kolsch v1.1), Wise One (Wit)On Deck: My Site: www.restlesscellars.com