First, glad to see you skipping the training wheel learning curve. Yes there are certain benefits but they just don't feel right.
As far as the SAGE having attachment points far a stabilizer or pressure button arrow rest, I'm not seeing it. Granted, I'm looking at web pictures but it's not there. I just bought their "Red Stag", a step or two up from the SAGE, & it doesn't have the stabilizer or through button mounts.
The quality/ cost relationship is on the buyers side. I don't know how Sammick can make a bow the equivelent of a 5 - 800 dollar "brand" for so little.
As far as attachments, Sammick does make Olympic bow. The Korean team used them recently & they make standard target bows & limbs on a few different levels.
I belong to a couple "Trad****" archery forums where these points are discussed at lenght.
BTW, what the Red STg does have is an additional limb locator/ stabilizer pin that the SAGE doesn't.