^^ agreed and not stupid at all, and don't be scared off by that statement. I knew I should have gone into more detail.
Basically, by going with a real suspension kit, your keeping all your angles pretty much the same. Due to the larger tires and rotating mass, you will need new brakes and rotors faster then you would have with out the lift.
Your tranny, engine, and other drivetrain have more of a work load, due to the heavier parts, and much more rolling resistance. They will wear faster (noticeable ? doubtful) Depending on your wheel off-set you could be wearing down bearings a bit faster. I am talking minimal tho, its not like your cutting its life in half or anything.
It applies more to "off-road" use. Once its lifted, you can go more places, and generally do. You will be putting a lot more abuse on the rig, mudding it and what not. Thats all. Off-roading will take its toll, but you pay to play.
So far, the only thing I have done to my truck is a broken E-brake due to being high-centered. But know, there are plenty of people on this site, with lifts, who do some minor off-roading and have had zero problems.