Well I am not the only one that does it, for me it's a secondary function, they act as a light function, always handy, this way I will never need to use more light source to produce me more light when I type and such.
As for colored lighting I prefer blue, since it gives me a comfortable background also, it gives my systems a neater and better look than some boring system without a light and all, but since you have no window it's 200% obvious you don't use or need lighting in them in the first place, everything I build in my systems has an important function and that goes for the hardware as the lighting,as for my age I am 34, I hope you don't have a problem with that, it's that most normal people simply don't have a problem with that
Really, when it comes to PC/Workstation/Server building it comes to perfection and without lights it's not complete for me, thus not perfect.
Due to my autism I have an own way of building and it only improves per detail per build, as your quote of me being the only one here that has lights and leds in a case, please if you are willing to look at the previous posts on the previous pages, there you will clearly see that there are more case modded builds in this topic that have lighting like mine, so as a fact it's the other way around man
My rule for building workstations, Servers & PC's has a simple rule that says it all:
If things don't have a purpose, they won't be added, if they do, they will be added, simple and plain 
But hey we all have different tastes as PC building goes, I do adore the Lian Li you chose though, are those case wheels from Aluminum also and do they have rubber padded wheels?