If you can get duplicates, there will [i]definitely[/i] be an issue.
Basically I interpreted what Bungie said as:
"Better buy this stuff up front while you can, because soon you'll have to spend $20 for just one emote you want and 29 duplicates that you don't."
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Who said anything about 20 dollars, or one emote? This is just sales 101. And there's zero reason for you to gamble on something random if you don't want to.