Its actually a pretty incredible idea to cap sparks for the player base and will likely increase SE revenue by a lot. Many players use sparks/accolade farming to raise gil to purchase items they want/need. A few players turn to RMT to buy gil for the same end purpose. By capping this stream, more players may be turning to RMT to get the gil they need. RMT will need to increase their accounts that 24/7 bot in order to make up the difference in their income per character.

Maybe with all that extra money they can hire people to police the bots...