I have what most would consider a pretty good shop setup. I know what it costs to build oak or maple cabinetry, or tables and chairs. To save $1000 on what would have been $5000 means I have an extra $1000 for something else, but I ain't building cabinets at a small fraction of the price.
Just for reference sake, good cabinet grade plywood costs about $45 up to $90 for the really good stuff. 4 sides can be gotten out of one sheet. Now you have the face and door back bottom and top, and maybe a drawer. Plus hardware.
If you have friends who built their cabinets for a small fraction than what can be purchased at Lowes, then they used crap wood and hardware. Otherwise they're blowing smoke at you.
I do smell smoke.
But can we be sure Lowes uses first class materials?