I always hated working with LME too, mostly because it's sticky, messy stuff. No matter how much I pre-warmed the extract or rinsed out the tubs afterward, I'd still have a mess all over the place. I also didn't much like how it would sink straight to the bottom of the kettle upon adding.
DME, while prone to clumping, wasn't as much of a hassle. The clumps float, and go away with a little whisking and boiling. Try to boil a kettle with LME in it before it's 100% incorporated, and I guarantee you'll scorch it.
Plus, who wants to measure out 120 grams of LME for a starter? Before I started AG brewing, I'd happily pay the extra price for good DME as opposed to sticky, messy, LME.
The Weekend Brewer formulas for LME -> DME conversion look a bit weird to me. The easiest thing is to remember that LME is about 20% water by weight. Therefore:
1 lb of LME = 0.8 lb of DME
1 lb of DME = 1 / 0.8 = 1.25 lb of LME