Simple, increase glimmer to 50,000 then go to speaker with that amount and purchase Silver
I would say 100 Silver for 50,000g, seems fair and hard to earn
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EDIT: Money would still be made by people who don't want to grind the glimmer, they can take the shortcut which is with money. I posted this because Destiny needs to do microtransactions correctly, if there is an alternative, then they have done it correctly, if its solely money, then there is controversy. The cheapest emote that can be purchased is worth 200 Silver, that is a lot of glimmer to be gathered.