First thing is, quit lookin' at all the cool supplier websites!!
Really though, my thoughts are almost the opposite regarding long term on a bike and mods.
Mod's to me are things you don't 'really' need, like a pipe for instance. When things wear out, I do install the best I can buy if its important, like chains/sprockets/suspension, driveability type-stuff.
And I do run my bikes to 100k plus as long as the 'value' is still there and my body is still in-sync with the comfort levels (sport versus touring, etc). At my age, each year goes exponential so you never know what the next year will bring
so my thoughts regarding mods are, if I'm running this bike into the ground, why do I want to bother with mods? Unless I'm going to buy they same model and the mods are interchangeable.
Besides, it costs plenty enuff just to keep a bike comfy, ie, seats, shocks (THAT is where i put my money, ohlins, penske, etc) but i only replace them when they are a problem for me (like, stock seats, they last about a week).
I sure have argued with myself plenty on this issue before, I think its a common biker malady (disease maybe?)_
and daymmit, I STILL want a remus!