The judges have already determined that "not earning enough" isn't a proportionate reason for splitting up a couple or family who are already living here. People win appeals on this all the time. But that's Leave to Remain - as I understand it, it's rare to win an Article 8 appeal for entry clearance, because you have to make a good case that you can't both live in the applicant's country. Having said that, if it's 26k, that might be seen as disproportionate anyway ...