I think this definitely says it best. If you are contracted, you can't. I WOULD NOT under any circumstance. That's your stand, and you gotta stand 'til the END. As a sub, you owe them (the teachers) nothing really. I'm going to guess your situation is like that of a lot of teachers out there now, not knowing when if ever a legitimate opportunity will come your way. A lot of teachers look at their local area, and see no light at the end of the tunnel (in terms of employment). You owe yourself the chance--when you go to interview, no one is going to give you credit for sitting out (and learning nothing). But many will give you credit for the time you spent in the classroom while those teachers were out. And yeah... some will hold it against you. But again, sitting out does NOTHING. YOU need experience. That's the bottom line. You can only get so much better sitting on the sidelines.