I honestly don't think it's as much about RMT spread as it is to prevent players from abusing the system. There will always be those few people that will transfer to a server (for whatever reason) and purposely screw with the economy. There's also the players that would abuse no gil cap to make profits by transferring between servers until they got what they wanted, then return to the server they liked best. Doesn't matter if it would be worth the trouble, there will be people who will do it because they think it's easier. And that would screw up multiple servers and affect other players.
I agree with lifting the cap to at least 5m. But there has to be a cap of some kind to prevent complete abuse by players.
