i think it's valid, but the problem with actions is we can't control how they're interpreted. do you mean "skipping" as in telling your therapist you don't want to come in or "skipping" as in not showing up for a scheduled appointment?

i imagine a therapist wouldn't think much about a client taking a planned week off. they take plenty of weeks off themselves. but i imagine the ghosting annoys them more than teaches them a lesson. if that's the goal, then have at it.
i don't think it's irresponsible, but i think if you have to pay for the missed appointment, the wasted money might not be worth the satisfaction of skipping.