I just noticed that people were selling their bitcointalk account here
And I am wondering how much mine would be worth
It is almost 10 years old !
Your BTT account is a gem you should keep for yourself and I am sure you will be happy you did because years from now you will browse through you comments/posts and laugh out loud. No money paid for it will ever replace that joy especially since you don't seem to be using your account for signature campaigns.
I would just say one thing to everyone who are willing to sell their accounts. No matter how high the rank you have as long as you do not sell it, it is worth any amount but as soon as you sell it, it will be worth zero. The reason i am saying this because sooner or later, people will know that it is a sold / bought account, and it will be tagged making it worthless. So better never sell your account and keep it with you even if you are not active.