That Logan underpinner is a cruel joke. Or maybe a feckless toy. You need a real one. Fletcher, Amp, Cassesse and some of the other "real" framing equipment manufacturers can sell you a foot operated version for around $1k, don't leave home without one. If you're serious, save up about $4,000 for a good air operated machine like an Amp VN-44 or a Fletcher 5700, and a few other worthy models. Or use polystyrene moulding which, assuming you have a perfect glue joint, is only weakened by the addition of v-nails.
The company with the "4" in the name is a poor source for moulding. You need to set up an account with a company like Omega Moulding which caters to the low end of the moulding market. And you need to buy by the box, which typically contains anywhere from 8 to 24 sticks, in the range of 4" to 2" wide. Or even better, buy at least 500 feet at a time which is where many manufacturers start to give you decent discounts.
It's difficult to justify framing for yourself unless you are producing pieces where the smaller dimension is larger than some minimum size, perhaps 20 inches. The labor required is pretty much the same for any size of frame, so the bigger the frame the more you earn for your time.
And selling 8x24 pieces for $90 will keep your career grounded pretty much forever.
PS, it only took about 500 frames before I figured out how to cut and join large, wide frames perfectly every time. Having reached that point, I can now build a frame for a mounted canvas in less time than it takes reach the end of my driveway, on my way to a framer. That makes homebrew framing my absolute most efficient path to product. But that didn't happen overnight.
[to do: insert paragraph about the very real possibility of chopping off one or more fingers while cutting miters]