4O4 Error
Correction: only the players aiming for a prestige class that requires a few ranks in a profession took it, and even then only the bare minimum required.
I groaned when I was playing Living Greyhawk and one of the magic items as a treasure was something that added +5 to Profession: gambler (cards of the shark). None of the players opted to take it as treasure and I honestly don't blame them. What profession as a skill needed was more utility - even in the Living Greyhawk setting which allowed for downtime - unspent time units for the year could be used for Profession/Craft rolls - Profession wasn't worth the time.
For the most part, there's no reason to buy into a profession/craft unless your're going for a prestige class, or plan on making magic items (yet another skill for wizards, sorcerer, clerics, etc to take, when they're already going to be tight on skill points). Although, I have taken a few ranks in profession/craft skills for flavor, its never all that many. Although, I so would have snagged those Cards of the Shark. But not until close to the end. They're flavor, but not useful...