Email:
You forget all the users at companies who do use a email-client.
You forget that many (perhaps even most) people in the world use a email-client.
You forget that many people are using a email-client to pick-up en send mail through their webmail address.

Browser protection:
Yes in Chrome, FF (and others) have some security implemented,
yet over 80% of the people who are using either of them (or both) still get their system infected.
Nothing wrong with some more protection/warning methods provided by avast.

Software updater:
Users can disable it, disable the pop-ups only or do both.

Remote connection/help:
It is not just for help with avast, it is a general remote connection option.

SecureLine:
It is a extra that people can buy.
It doesn’t come packed with the av.
It is optional.

GrimeFighter:
Since it is a standalone application, integration would be a silly thing to do.

Rescue disc:
If there was no need/requests for it, it would not be integrated.
So yes, there are a lot of people who are using it.

What a av should do:
*1)
avast works in the background.
Users have the choice if they want to get warned or not when something is found.
I bet most people have the warnings on and not like you say off.

*2)
Yes it is logical that a registration expires.
One year is only for the free version and for those who bought a one year subscription.
Paid users have to option to auto-renew.
The expiration of one year for the free version is to keep track on how many (approximately) people are using it.

Next time before posting, please make yourself familiar with the options avast (or any other software) has and get your facts right.

PC repair isn’t cheap?
Perhaps you are charging people too much.
€20,00 is what I charge per hour (commercially)