Because there is not the road infrastructure, sea/ landing infrastructure, electrical infrastructure, basically there are no positives for the Scard installation. In addition, from a wind perspective, Scard is only good for southerly and westerly winds.
Jurby, which was selected as the best place years ago, is virtually on the coast, with good road infrastructure, it is a brown field site already flat and ready to go. Electrical infrastructure is there, but not great. However, it can link in with the proposed solar farm at Andreas, work that will have to be done anyway. Jurby is also good for wind from 3 of the 4 directions. Installation cost will be a fraction of the cost of Scard. It is actually a no brainer.