I make a fair amount of baby blankets, but in general, I don't do many adult size blankets because I have a short attention span, and tend to lose steam about a third of the way through. I think non crocheters/knitters underestimate just how long it takes to crank out a blanket.
I have realized that folks also drastically underestimate how much the materials for such a blanket cost. Even if you use the cheapest acrylic yarn available, you're still talking about probably between $30-$50 for a blanket.
This year, I've decided to try to combine something I've been getting requests for, (lots of blankets,) with something I want, (to trim down my ginormous thrifted-clearanced-inherited yarn stash.) I'm going to spend the rest of the year making granny squares, and assemble the resulting pile into however many blankets I can come up with, to give at Christmas.