Hopefully this exploit is a mistake by Bungie and not the direction of this game.
[url=https://www.youtube.com/embed/sEPkxDdnf_o]https://www.youtube.com/embed/sEPkxDdnf_o[/url]
As shown in the video, you can convert real $ to Legendary Marks. If you are willing to pay for the silver and spend the time conveying it into Legendary Marks, you can buy planetary materials and rank up with factions as much as you like. Except for artifacts (which drop in Iron Banner btw) you can reach max light without having to actually play the game.
This is ridiculous and the game needs a hot fix ASAP.
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You're looking at "buying" 3-5 marks for $2. It costs 10 marks to buy 20 materials. It costs 25 materials to gain 50 reputation. And you need 2500 reputation to level up a faction. With all those numbers you can calculate that to level up a faction a single time using this method would cost you $250-$418. No sane person would ever spend so much money for so little gain. Anyone that does clearly wasn't going to hold on to that money for long anyway. At least they'll be funding Destiny for me.