Odhanan
Adventurer
Same opinion as Crothian here: infinite.
Not only because players like them, because I do to. It makes sure the probability of characters of the same level being statistically equal is almost non-existent, which is good for believability. Plus, I make sure to work PrCs chosen by players and chosen (by me) for NPCs into the setting's background. That's why there are here: to forge a mechanical link between the character and the world around. To make sure the character is part of this world. Which again, when done right, increases believability.
So I'm all for PrCs. Not Second Edition kits, mind you.
Not only because players like them, because I do to. It makes sure the probability of characters of the same level being statistically equal is almost non-existent, which is good for believability. Plus, I make sure to work PrCs chosen by players and chosen (by me) for NPCs into the setting's background. That's why there are here: to forge a mechanical link between the character and the world around. To make sure the character is part of this world. Which again, when done right, increases believability.
So I'm all for PrCs. Not Second Edition kits, mind you.