While you may offer this as a legit service... there are many people in the game who use this as a scam. I also know its againt the TOS to sell platinum for gold/items. While you aren't doing that directly, it's kind of a gray area that you may not want to be involved in.
Your best bet, if you're looking to make some gold with your plat, maybe buy uncrafted items and craft them and re-sell them for profit. I haven't looked at prices to know what the return is, but it might be easier for ya.
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