Would you be willing to pay for exotic weapons and armour on destiny ?
Ghallajorn $4.99
Hardlight $3.99
No lands beyond $0.25
Exotic armour $2.99
Custom shaders/sparrows $0.99
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Any micro transactions should be for aesthetic upgrades only - shaders, ships, cloaks/marks etc. That way there's no negative effects on people who don't want to pour more money into a game.