How to reduce storage needs and monetize unused accounts

So, what got to my mind is that if a player isnt active in, lets say every 3 months, he/she recieves a warning through email, and when he/she is inactive for a year, the account is outdated, and auctioned to a market (with ranks resetted). Basically, you are making space available, monetizing inactive accounts, by that reducing the sale of bot-leveled accounts (accounts sold through various 3rd party sites). So, you make a lot of money, save money, and reduce misuse of the game.