Its for those people that have more than 30 games on the go at a time. Currently the maximun number of games you can view in My Games is 30 and there are page navigations at the bottom.
At one stage you could have a whole page containing all your games regardless of the number. However, this was removed as it is very intensive on the database and detroys the performance.
So I don't think it will be back until the admins seriously upgrade their hardware.