And Messi played his part in that. Regular wage increases and demands over who to sign. What people forget is that every time he got an increase, many other players demanded and got one. That's what happened at United in 2010 when Rooney supposedly threatened to leave.
I was told that was a put-up job, probably with the connivance of Gill & Ferguson, to get the Glazers to increase the low wage ceiling they had at the time. So Rooney doubled his basic but there were about 5 other players who had the contractual right to get the same basic. And even if you were on £40k, £50k or £60k a week, instead of the £90k a week the top earners were getting, you got double. That's when their wage bill starting shooting up and that's what will have happened to Barca as well.
Messi can cry all he likes but he should shoulder some of the blame.