First, if it is not a BF dealer member, then leave out the seller names.
Second, cheap knives normally have softer steel. Softer steel is much easier to put an edge on.
A multitude of experienced people have found that VG10 takes a good edge and holds it significantly better than the blade on a $3.00 knife. I suggest spending some time reading in the Maintenance Forum. To put it bluntly, I don't think you have sufficient experience to point at the heat treat. There are other factors to consider.
When using a Sharpmaker, it won't actually sharpen the edge until the edge angle on the blade matches the angle of the Sharpmaker. This is called, changing the bevel angle. That happens WAY quicker when sharpening a blade made of soft steel, than with properly heat treated steel. It also happens a lot faster with steel that does not contain carbides than with steel that does contain carbides.
VG10 contains carbides, and it is heat treated to ~59 HRC. Neither 8Cr14MoV nor the $3.00 big box knife steel have carbides. So it is going to be much harder to sharpen VG10 than either of the others. But once sharpened, the VG10 will hold an edge significantly longer. Being into traditional pocket knives, I am very familiar with the vagaries of soft steel. Cough Case Cough.
Check the Maintenance Forum for threads on Sharpmakers and on using a sharpie to determine if you have matched the edge angles.