Guesswork here, but it might be possible due to a selection effect. If you can obtain a mortgage, you are more likely to (be willing to) spend more on that mor

Guesswork here, but it might be possible due to a selection effect. If you can obtain a mortgage, you are more likely to (be willing to) spend more on that mortgage than you would on the rent for a number of reasons. Anecdotally, I see people attempting to spend as little as possible on flatshares because they don't think they'll ever have a high enough income to bother with that, so they don't save either, and just enjoy themselves with the money left over (spending as little time at home as possible).