This suggestion is a little bit misleading, since the idea that it's on OSRS so therefore should be on Alora is wrong (most people who commented feedback said that since it's on OSRS it should be on Alora). On OSRS, the most gold you can consistently get from pickpocketing is 80 coins per attempt (Hero's in Ardougne), whereas on Alora it's more along the lines of 11,500. That's 143x more gold than on OSRS, however most of the prices, npc drops, and other forms of obtaining gold on Alora are nowhere near that high of a multiplier. This means that doubling the amount of gold that comes in from thieving will flood the game with a lot of gold that wasn't previously there, and at a much faster rate than previously.
Yeah makes sense. Although i think most people would use the feature for the actual items like blood shards, crystal shards etc. So the set effect could just be added for actual items and not for the coins.