I've flown with several FOs in the last couple years that spent 3-5 years at AMF, and then came to SkyWest with well over 1000 PIC Turbine. They found they coundn't make another move without the 121 time. One guy had over 4000 PIC turbine. I've also flown with a guy from Airnet that had been a Lear captain, he also had a couple thousand TPIC. Every regional out there will give you a better schedule than AMF.
Might not be the case for those guys, but maybe not everyone at freight companies like AMF WANTS to work at a 121 carrier. I have quite a few friends who went that route for a couple of years and found EXCELLENT jobs in the corporate world. Talk about QOL, schedules, and pay to boot! Makes all regionals suck, and yes, even skypest!