The Ad is being run in a number of essex papers. I don't think people can complain of minimal advertising. There have been ads in the Daily Mail and local papers. I've also seen ads online.
There are a number of reasons flight prices can be high including the possibility of the route being dropped but lets just calm down and wait instead of writing off everything SEN does.
And again, I repeat my point about the airport website means nothing. Updating a website can be a task given to an intern. Most good airports don't often have an updated website so I wouldn't read too much into what you find on an online route map.