Petr, a sarnie is a sandwich. Speaking as a session organiser who worked for 18 months without seeing a sandwich, a free beer or a penny I have to say that being paid would have made a big difference as to whether I kept going or not. It's a lot of work and commitment and there are few compensations beyond a love of the music which you often can't enjoy because you have one eye on your watch trying not to let the session or musician run over. There's the agony of the graveyard spot which always falls to the organiser, the booked act who doesn't turn up; or they do and the audience don't, the prima donna's,those who insist on a 97 verse song at the very end of night etc.etc. There's also a lot of fun of course but on the whole, only a good healthy bribe would induce me back into it.