Have you ever considered that the reason that there were so few passengers on your flight is because people are now using Barcelona El Prat with other airlines, having got fed up with the fact that Ryanair are no longer supplying the service to Reus that they used to do.  I rarely bother to look at what Ryanair are providing in the way of flights to and from Reus during the winter months as I know that there will be nothing to meet my needs, and if that applies to me then it applies to others too.  I understand that Ryanair are a business but their business is supposedly supplying an air service !!.