I flew on a B1900 from LAX to Merced a few weeks ago - they have stripped the interior down to 9 pax seats because they can't get FOs with ATPLs.
The cost of living in the USA is very very low compared to here. 3 of us ate breakfast in a diner every morning for less than $25 including tips - you would be hard pressed to get breakfast for one in Australia at that price.
Preferred spirit of Choice in Aus is $58 for 750ml or $30 for 1.75lts in the US... that's $78/lt vs $18/lt for exactly the same product.
Fresh fruit and veg about half of the Aus price.
On the down side, these low prices are due low taxes which means not much social support as we know it here. All fine till you get sick!
You can't judge the advert till you make an application and get more info. I suggest it is a recruitment firm on a fishing trip or an operator doing same.
Surely it can't hurt to apply and find out?