The reasons are many...
Because I wanted one!
Really, I have owned Toyota 4WD Pickups, 2 4Runners, and didn't really figure out the Land Cruiser thing until my family started outgrowing our 4Runner. If I only knew then what I know now, right?
Durability-All my Toyota 4WDs together don't equal the amount of problems I had in a 1 1/2 years of ownership of a new 84 Chevy Blazer. Needless to say, I went back to Toyota and won't own anything else. Toyota is the ONLY brand vehicle that I have been willing to buy used due to the quality of Toyota. My 97 CE has just turned over 81,000 miles and it is in near perfect shape.
Styling, I think that even though my 80 Series styling is well over a decade old, it is still a head turner and looks just as good today in 2006 as it did when it was brand new in 97. The styling is timeless.
Luxury, the interior is comfortable, roomy, and at least for me ergonomically correct. All the controls are within easy reach and are similar in layout to our Camry.
Design, after owning both solid axle and ifs Toyotas, solid axle is another feature I wanted in a full size SUV. Land Rovers are crap, and don't hold their value. On the other hand, a LC holds value, doesn't break down, and you can't beat them. It was easy to lift and modify and drives better than stock even after the mods.
Now, if only I could figure out a way to talk my wife into a 100 series when we replace her Camry. She says one gas hog in the family fleet is enough, but she sure likes using it to haul our kids and their friends around.