Fish, pond, fishermen and seagulls.
Since joining Barcelona there's the numerous cases of off the pitch issues, Barcelona having to go look for him because he didn't show up for training and not to mention his fecking injuries.
Combine this with Barcelonas situation, where they can't actually afford to let him go at a lower price, you're either looking at a Coutinho type of loan for a short period of time or forking out what Barcelona needs to balance their books, which essentially means forking out more than we already can't pay for Sancho.
It doesn't really sound like such a good idea.