I dont wanna to damage your account, but the link you provide does appear that you had posted atleast once at each period to get the activity, and after looking the last trasactions with potencial hero this account looks to be at an amazing value, even knowing there is a long journey till achieve the hero status.
The way you expect to do business with those accounts does it include an escrow, because its a good ammount to anyone risk to go first, and just one note, this account needs a lot improvements to get accepted into signatures, if the buyer has those purpose.