>Trainings are given for free in coops? I can't imagine myself or my friends working for free, are you forced to work for free in a coop? As in, would I be forced to give trainings too? I value my time too much for this. Of course I do the occasional free tech talk for my friends/the public, but that's not in any way comparable to a "full" training.

No one said anything about training for free. This was an example of work that needs to be done for a client that you may not want to do yourself. A junior level member of your coop could travel to the client's site and train them on how to use your software, learn from the experience and make valuable ties, while you stay at home and work on more appropriate tasks.