I tend to keep a couple lbs of DME on hand for starters and to use in case my OG turns out lower than expected. It stores better than LME and it's easier to measure say 9oz. of DME vs. 1/2 a jug of LME.
However, there are more varieties of LME, and I do on occasion take advantage of that. For example, last year I did a dopplebock on a new BIAB large grain bill system. I figured ahead of time that my mash efficiency would suffer so I ordered a jug of Munich LME.
So, I guess both varieties have their place.