Adcom GFP 750: why spend more?

After reading all the rave reviews since the late 90's I finally caved in and bought a second hand unit...no need to say more, it is quite an amazingly transparent gear and smoked my VTL 5.5 in the area of transparency, neutrality and bass control....and with my tube DAC, I do not need more tube magic in my system.
I am wondering what can be gained by spending more all the way to 20 times more to buy an active SS or tube preamp that will induce some coloration at best. In other words, when the almost ideal absence of coloration is available with balanced in-out, remote, balance control, HT by-pass and pre-out, when is more needed, really? Please educate me on the benefits of "more" when less is likely more in the world of preamps..am I missing something?