Because my favorite tip, the giant chisel tip (don't know the correct name) has been used for over a year now, sometimes on rather high temps (>450 degrees) and even occasional plastic melting, which I'm well aware is not good for them.
Anyway, after wrapping the heater in foil for better themal transfer, this iron is astounding, at 450 degrees it can solder onto 1.5mm sheet metal.
Here is the condition of mine after a year, and yes, I'm aware that my camera's focusing mechanism has ADHD, like me.

I'm not sure about you, but for an insanely cheap tip (it came with the station) to last a year through some rather abusive soldering sessions, I'm very impressed. Dave has said that the cheap stuff isn't worth dealing with, but I honestly have to disagree.