I, and many of my team, are getting increasingly annoyed by the banner adds in our OnDemand instance.
I have about 10 Jira/Confluence/Bamboo tabs open at any given instance and I find myself having random banner adds on them all. Even if I clear them.
It's clearly something you want expand on and I appreciate that it's handy for the occasional message but you are using it to advertise conferences and other paid products on a site we pay plenty of money for already. I haven't read the T's&C's but this isn't an ad supported product.
IMHO Be careful how far your push this model