If you remove all the Bots on server 2, then you might as well offer a transfer of players on server 2 to server 1. Server 2 is full of either 150m off/def players and people with maybe 1 to 2 mil off/def, as I have been playing solely on server 2, it's deader than all my infantry in the BG's ! You might see the above as irrelevant information, but it's important to note that server 2 is primarily full of alts from server 1 and brand new players, so you factor in that the brand new players will not sink in any $$ (some will, but in my opinion, very few will) and the players who have other characters on server 1 will always spend money $$, creating a harsh imbalance and causing new players to quit, due to lack of an army.
Removing these will honestly not solve anything, and chances are plarium put them there in the first place ;p
I would love to see a "paid" (we all know plarium loves $$$ :D) option to transfer to server 1, so active players can see what it's like to actually have consistent pvp.
I digress and just want to state that given the current state of server 2, we need the bot castles for loot. Sad but a reality :(