They use one of those "may not require a FO, but the plane can be flown 2 crew" reasonings to let you log the flight time.
They get an insurance discount for flying it multi-crew....and someone to help hump boxes at the outstations.
If you really want to build time -and get paid...last I knew, they would fly 60-80 hours an month.
Can't speak to the current wages. 10 yrs. ago it was like $10/hr...but, then again, a LOT of places were!!
It's not the worst way to start a career. And, you will learn a lot.