You should mention and tackle what possibilities that are there that you could steal stuff from the account , like trading of items , deletion of items or any detriment you can cause.
Do the games have a proper password recovery system if you steal it ?
Can you change the password reset questions ?
Can you transfer items in any way?
Also , you should tackle what exactly will you provide. How fast can you grind and how long will you take for each package ?
1) Collateral? For a service im providing? No. Its not like im asking for a loan or something.
2) No need, I gain nothing stealing someones account. I care about my rep.
3) No, I highly doubt I can change anything without having access to the person email account. Again, why the hell would I want to?
4) I see you not familiar with the games I am providing a service for. You can't transfer items nor delete items.
5) Each package is time grinding or you just didn't read that part?