Dreaddisease said:
and sometimes we as players get bored with our characters. We really thought that our dwarven defender would be great but after 3 levels of playing him we realize that he is useless. Takes him twice as long to get into battle because of his armor. His damage, though consistent, does not match the ranger, plus the enemy is always moving, making it hard to do our stance. We really thought that bard would be a great addition to the party but find that the hack and slash games are not conducive to what the character intention was.
That's what I see as the worst reason. People who change characters because their current character is "useless" just end up changing characters every other game if you let them, because a character is only as useless as you play it. When you end up with one of these guys who's constantly complaining about how every other character is more powerful than his, what you need to do is teach him how to play. 99% of the time it's just a case of "greener grass."
Some players will also use this as a cheap way to get higher stats. If you keep dumping characters until you get good stat rolls, you're going to get really good stats soon enough.
I agree with the idea that new characters already suffer some penalty from not having as much background, but the same type of player who does the character shuffle is the one who doesn't know what to do with a background (or doesn't care about it) anyway.
Usually, we'll give a new player some leeway for changing character features or even changing a character once, but it's not such a good idea to let it become a regular thing, unless you really want that disposable character feel of a computer RPG.
If people really get bored with their current characters, there's no reason they can't do something different with them. Multi-class, join a new cult, get polymorphed, play an alignment change, develop multiple personalities. Strike a Faustian bargain, get possessed. Seek lichdom. Talk with your DM about arranging some lycanthropy. Uncover the secret of your lost heritage. Come out of the closet.
Develop the character in game. Any DM worth spit can come up with a nice balanced way to make such things work.