Phileas - we're talking about a 46-seat aircraft flying once per week for 18 weekends over the summer. Assuming everyone does a return rather than just one-ways, that gives a maximum of about 1,600 passengers for the whole summer.
In summer 2011 when the economy was a little weaker, the route managed 1,489 charter passengers. In summer 2012, Citywing on the route managed 3,590 scheduled passengers
Oxford-Jersey is being attempted on a very modest basis. There really isn't a need to be quite so negative about something quite so small.