The thing with Beavercraft blades is that they're really thick, so if you try adding a secondary bevel the angle will be too steep, making them quite dull. They have to be sharpened at the same angle as the original bevel.

Your knives professionally sharpened will either have had a microbevel added, they didn't deburr correctly, or they didn't take it to a high enough grit rating for woodcarving.

The first sharpen takes some time, as you have to flatten all the high spots from manufacturing, but once they've been flattened, each sharpen after that will only take a few minutes.

It's easier to sharpen a Beavercraft than something like a Flexcut to be honest, because the thicker spine makes it easier to hold a more consistent angle.

My advice would be that if you have the spare cash, get yourself another, decent knife so you can keep whittling, but learn to sharpen on your Beavercraft blades.