Thank you for your new question.
This is an often fought battle, the key before you do this is that you have to have the plug in that does not infringe or intrude on their software. If the plug in intrudes on their software it is considered still a copyright violation and if they find someone using a plug in to access their software they can shut you down. I know you are charging for homemade currency, but the botXXXXX XXXXXne is they are paying to access things in the game and this is infringing on the rights of the copyright holder and would violate the game's license and terms and this is going to cause your legal problem. I'm not quite sure how to get around that either as this is a real fast emerging area of law on which there is not a lot of support that allows someone to make a plug in to intrude on another person's intellectual property, even though you do not use their code or program.
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