I had the pleasure of having discussion with the International Sales Manager and Network Planner of Vueling recently and it seems that the Canaries do not fit in with their operation style due to the sector length. They only tend to operate the long sectors from their main base at Barcelona.
Of course these operation styles alter and you never know in the future this stance may change. Also at present Vueling do not fly to TFS they have a base in TFN which is not ideal for leisure traffic.