If you want to sound like a company try to use these kinda questions ( spam them like a bot)
it will convince ppl even more if they think they are talking to some kind of bot who sends there answers to the adminstration which will calculate the price.
We saw that you are selling your account and we are interested to buy it.
If you are interested i will ask you some questions.
1.) Has this account ever been temporarly banned or being flagged for illegal actions ?
2.) Are you the only one who has full acces to your account, including all required information ?
3.) Is the account still transferable ?
4.) Do you play on EU / US ?
5.) How much gold (excluding items) is on the account ?
6.) How much playing time is left on the account ?
7.) How much Money do you expect for your account, and what currency do you prefer ?
8.) Is the item description complete you gave on the website ?
9.) Is there anything special concerning your account, we should know about ?
10.) Have you ever been involved in any illegal actions especially fraud ?
11.) Are you at legal age in your country ?
12.) Do you have PayPal ?
12.1) If so, are you verified at PayPal.
etc. ofc you can change the questions add some remove some just as you prefer..
these are only an exampel