system
20
Having to disinfect ‘every day’ seems a bit of an exaggeration to me - in my experience it’s rare to see an attempted infection (other than false positives) more often than once or twice every few months unless I’m on particularly seedy sites, and I’m pretty confident that there haven’t been any unnoticed infections too. However, based on personal experiences of running without an antivirus, that’s basically just inviting any old virus in and does lead to a lot of easily avoided hassle.
There may indeed be some benefits to Avast’s connectivity options, but the idea people seem to be spreading that the software is not complete without them is worrying, because I’d rather my antivirus still work to a reasonable level when I’m not online! 
Bandwidth isn’t an issue here, at least not in the sense of any kind of data cap, but I generally prefer to have as little going on as possible, to reduce interruptions during gaming and just for kinda OCD reasons.