No, it wasn't a reason he use an installer. It is just an added tidbit in an installer. However, my point is this: the installer was used instead of zipped file because this modpack is easier to install with an installer executive instead of zipped file.
Granted there are few awkwardness for tiny percentage of users, but the majority install this modpack just fine with this installer. The same wouldn't had been said if Afforess use zipped file.
Then we are in that minority of users who find unpacking a zip file easier than running an exe that can't even find the directory, and which also takes 12 minutes or more to run.
I have to admit, that in my case, I'm against the current trend. That is, everyone on the net says "come on, hard disk space is free! hundreds of gigs! why care about a few hundred megs!"
Well I do care. Actually bandwidth is cheaper for me than hard disk... That is, it'd be better for me to download the zip file (in my workplace), put it on a dvd and at home, extract it from the dvd right onto the civ4 directory, no drive C temp files involved. Yes, I had a hard time making 1,5GB free on drive C. A new laptop hdd doesn't come with my breakfast

But I guess I'm the minority
Though this problem does arise in several other applications and they can add up pretty nicely... Adobe reader taking up 100-200MB (switched to Foxit, less than 10MB), browser necessary log, etc. files taking up 100s of megs etc. I remember when I had a 40MB hard disk. People could write software at the time. Now they don't have to... (Nothing to do with this nice mod's author, he has to use what limits the game gives for modding).
Anyway, sorry for the detour. But I have to do something while I'm trying to convince myself of buying extra RAM, so I'm here writing stupid stuff.
Still hard to accept that 2GB is not enough for this program... It's not even a real 3D application or what. It has a limited number of different graphic elements on a relatively small map. (I mean, if I can run Oblivion or NWN2 then why won't a civ4 mod run???) As far as I've read in some threads, one reason (at least for the slowness) can be the lot of python codes. (Do I understand correctly, there is interpreted code in this game? Funny, as when I used Basic for programming, it was viewed upon as useless

)