Same thing happens with a desktop, even if you completely customize it. If you take your old desktop from four years ago, to have it compare to whats on the market now a days you're still lookin at a new motherboard, more ram, upgraded video card, new processor...so on and so forth.
The decision between a desktop and a laptop comes down to mobility. Are you going to be using a computer in class, taking notes? Possibly in the library? At home and at work? If you will be using it in many different places, then a laptop is great for you.
On the other hand, if you don't need it outside of your house/dorm then a desktop is probably a better option. Much much much better system specs for the same price as a laptop, or you can get equivalent specs as a laptop and spend half the price.
You're paying for mobility with a laptop. That's what you need to decide, whether you will want/need the mobility.
You're not drunk if you can lie on the floor without holding on
(n.): Something that can be looked down on and approved of at the same time.