So... it simply sounds like you like to ride- get in shape(boost the cardio some) , enjoy the outdoors and life !
I think most here also share the same base reasons for riding as well.
As far as what your saying when you say " why deny technology improvements" , ... well, to each his own.
Most people who buy a full suspenstion rig tend to do so with a Aluminum frame(most cost affective, stiff, front/rear susp. ...... frame material is still important- but not nearly as critical as when you go hard-tail).
Personally, I do not deny technology either- man, front fork technology is WAY out there.... talk about every 3-4 years it just jumps leaps + bounds !!!!
, 9-speed system at my thumb-tips
, clipless pedals, V-brakes (or disc if that is your method of stopping power) , etc.
BTW, on my MTB- I currently have slicks on my wheels(if you typically ride road w/ your MTB...... you might want to invest $40 into a set for that purpose... and yes you will roll faster up/down the road
).
Also.. BTW, I concur with the other poster, having to remove your headset to clean- then reinstall should be every 5-10 years - for most riders, even riders who ride 5 days per week- HARD
The bike shop who told you , that in order to "maintain" your bike , was either 1. seeing you have a high end MTB $$ , and maybe also you have $$ coming out your A$$ - so why not get this guy in our shop to spend even MORE money on his bike, or 2. did not know what they were talking about , or 1 + 2 combined
.... maybe I'll get bold enough to post pics. of my MTB here one day