Wow, I had no idea the ikea delivery fee was such a contentious point!
Obviously, as with any expense, there are situations in which it is 100% justifiable. Maybe my friend has such a situation and hasn't disclosed that on FB. I just thought the juxtaposition of "moving is so expensive" and "we bought a bunch of stuff at Ikea" was funny, and this is the comedy section of the forum.
As far as buying furniture on CL goes...it is definitely a pain without a car, and if you did not own a car I could see that just buying everything at Ikea and having it delivered could be the most sensible option, especially if you need to purchase unwieldy items like a mattress. However, friend does own a car and did move her mattress, so it seemed to me that perhaps she could have furnished her apartment at a slower rate by nabbing items off CL as they became available. When my husband and I moved in together, we used a cardboard copy paper box as a table for a couple of weeks until a table we liked came available on CL. Wouldn't have wanted to do it forever, but it was fun and kind of romantic for two weeks :)
Anyway, it turns out one of the items she bought was a couch, which probably would be hard to fit in a car. And I'm not sure I would be thrilled about getting a couch off craigslist. So her use of Ikea and delivery is now slightly less puzzling.