Commercial model for Twitter

How to make money from Twitter?

This wonderful free service has no commercial opportunity, those that have tried have failed…
One of the missing features is the ability to have links on the ‘twitter background’ and this is worth paying for – what about offering for a small annual fee the ability to have an active link in the background area? Pay per additional link and pay to have an RSS feed?

Those that want it will but it – those that don’t wont.. and it wont interfere with third party apps – although some may be clever and list one of the links with each post…
I want twitter to survive and if the sums are right I think this could ensure the future of this brilliant service.