I've been using Avast! for years. Recently I noticed that taking the default install would subject me to "please buy me" stuff for the options I had installed that cost money. Which when I thought about it makes sense. If I install something that costs money, and don't buy it, sure it's going to ask me. No big deal, modify the install, uncheck the stuff that costs (like GrimeFighter), and voila! No more reminders to buy stuff that you installed and didn't pay for.
Personally, I am grateful to Avast for providing a free tool to protect my Windows computers. I consider having to perform a custom install and only install the free portions a small thing to have to do in order to get this capability.