Disproportionate is easy to attain and when it comes to optics, I would rather err on the side of quality than crap. I have a $450 S&W M&P 15-22 with a $660 Aimpoint red dot and a $1600 Gen II NV scope, plus several other features including $60 bipod, $35 Solarforce IR light, $180 Surefire white light, $8 sling.
It has been my experience (and I know there are exceptions) that poor optics can turn a very good gun into one with unreliable POA/POI relationships but that a quality optic can help a shooter get the most from the gun and the best part is that a quality optic can be moved between platforms over a long service life.