Depends on your ability to self-insure. For someone needing temporary insurance for one month, if they are young and healthy... the difference is an extra $57 to avoid a very small chance to avoid a bill of an extra $4,900. That means there would have to be what, maybe a 1.2-1.3% chance of having a catastrophic illness or injury in one month for the bronze to break even?
Or even a short-term plan which might cost about $90, with a $10K deductible. For someone young and healthy the odds suggest the short term plan if you *know* you will have "regular" employer insurance in a month or two (which may not be a lot cheaper, but will be pre-tax and with much better benefits in most cases). But admittedly some decisions aren't 100% on the numbers, and may have a little risk aversion premium built into them. And that's fine, as long as you understand that for what it is.