Title says all. Sign here if you're willing to pay $30 to have an additional character slot. If Bungie will do this then you can have as many toons as you can afford!
Edit 1: It seems like 1/4 of voters says yes. It confirms that there is a market willing to pay for this.
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No...it would give those having an extra character the clear advantage to boost their RNG. I personally think you should be able to have 9 characters (for free)...but only can get Nightfall drops, and raid drops three times a week.