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Well scammers are entirely a different discussion. If you are a scammer, you don't deserve any place or a name in here. You'll get tagged along with your alt.
You can have an alt for multiple purposes. I'll quote one reply I remember from DdmrDdmr in B&H that pretty much sums it up for good reasons to have alts.
Alt accounts can be created for numerous purposes, not necessarily related to anything wrongful, such as (but not limited to):
- Separating a bounty account from a discussion account.
- Separating a business account from a discussion account.
- Distinguishing between when one is fully focused in their posting, from when one is posting on the move.
- Separating the main account from other accounts related to building services around the forum (i.e. scrapers, legit bots, etc.).
- Shielding behind a new account to express opinions or report on accounts, while not wanting this to be linked to the main account.
- One can have multiple accounts to enrol in different campaigns, providing the rules are met and the ethics clean and square (as I mentioned previously).
I’ve got a couple Alts I recall: One to scrape information from the forum, and another to block the name from being used by anybody else (both with 0 post).
I edited my first reply to the OP, since I don't think that's the answer s/he is looking for.