I think those who're in the position to pay more than $100 for going to a concert and another $50 for meeting a few composers may as well can, as long as they don't feel ripped off.
While I personally don't give a shit whether or not Play used Disney material illegaly, I'd definitely consider the satisfaction of the composers an important aspect for chosing which concert to attend to. But again, I think VGL and Play aren't alternatives to each other, I mean, most people can go to BOTH and get the FULL game music experience.
Luckily, Thomas Böcker's GC concerts don't have those problems, the tickets are cheap and the concert offers a great selection of premieres and special guests.

Definitely attending this next year.
Jam it back in, in the dark.