I was weighing the difference between spending the money and having to cut back on other things vs. possibly missing out on them when I've already got the first two Aliens books. (Add to which I've been privately telling myself for years that I'd only start collecting the comics if someone did convenient, properly comprehensive collections of everything, and these are those.) In the end I decided I'd be pissed off if I didn't have them.
Probably didn't need to order all three in one go, but that's alcohol for you. Don't drink and online shop, kids!