Obviously this account is worth a lot for the seller and as a seller he may decide his own price.
A reminder for the seller: this account obviously has a huge emotional value for you because you spent a lot of money and time on this account. Just remember there is a difference between emotional value and actual value. I agree with the people saying you overestimate this account. While the account may be emotionally worth 4000€ for you, the actual value is way lower than that. You might as well try to sell it for 10000€ and you'll still never find a buyer because it's just not worth it..
In the end, the synergy between buyer and seller is what determines the price. So if anybody is crazy enough to actually spend more than 1000€ on an account, I believe they might as well pay 4000€