GMs please police bots on Ygg/valk too. We are not less important than the players on Ymir we should be getting equally good service when paying VIP.
It's not that ygg/valk are less important compared to ymir. it's just that the programs used automatically replace the bot with another. You would need a gm patrolling every map at every hour. Unfortunately in-game service is either a second or third duty compared to other services like tech support, dev, etc. and most only show up in game on their down or off time as a gm or they play there own non gm account.
the bots spread like wildfire due to the free service of ygg/valk as well as the profit they can make compared to ymir. People may hate em but as long as someone buys the zeny they will keep on going. And even if no one ever bought the zeny they would continue because they can run them without any loss in profit.