Why does yahoo IM still limit me to 1,000 entries in my Yahoo Instant Messenger

Why does yahoo IM still limit me to 1,000 entries in my Yahoo Instant Messenger? In this day and age when I can buy a terabyte hard drive for about $80, and GMail offers me 6 gigabytes of email storage. Why is Yahoo still being so stingy? MySpace was the leader in social networking and never changed while competitors innovated. Anyone remember MySpace?