1. A lot more effort is needed. You have to write an AU history, plot connections with other players, learn the setting, etc. This is also partially why AUs based on real world settings tend to do somewhat better. 2. A lot of people actually don't care for playing with AUs and will even avoid regular games that accept them. 3. Even after you write your history and get into the game, an AU game requires more effort in plotting since you'll want to build connections with others in the game both via new CR and CR that exists in the background. 4. AUs by default tend to remove or change powers and humanize non-human characters. Immortal or long lived characters will typically be reduced to a human lifespan. A lot of those things may not have an alternate way to develop them into a similar personality and it may cause a PB to be needed.
So overall it boils down to partially too much effort and partially aversion to AUs.
no subject
1. A lot more effort is needed. You have to write an AU history, plot connections with other players, learn the setting, etc. This is also partially why AUs based on real world settings tend to do somewhat better.
2. A lot of people actually don't care for playing with AUs and will even avoid regular games that accept them.
3. Even after you write your history and get into the game, an AU game requires more effort in plotting since you'll want to build connections with others in the game both via new CR and CR that exists in the background.
4. AUs by default tend to remove or change powers and humanize non-human characters. Immortal or long lived characters will typically be reduced to a human lifespan. A lot of those things may not have an alternate way to develop them into a similar personality and it may cause a PB to be needed.
So overall it boils down to partially too much effort and partially aversion to AUs.