Good idea. I would add an alternate suggestion - let a vendor (such as the speaker) sell skeleton keys for Legendary marks. Or maybe Xur for strange coins.
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Maybe Shiro, instead of the Speaker. Make them 50 Marks a piece?
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At least 100, given how it is essentially 1 or 2 high light gear pieces that cost 150 marks at vendors for lower light versions.
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I like this idea