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My answer will be:
Because I still use it on other machines at home,at work and recommend it to clients…I have changed to CIS because I was curious about it,I am still a big supporter of avast and still send them samples (Ask Milos if you want)…Not using avast doesnt mean you arent going to go their forums,for me avast is still one of my recommended AV’s even when I dont use it ;D
I see even SpeedyPC isnt using avast but using CIS…No one questioned him about his presence over here IMO :
Anyways,sooner or later I will come back to avast,dont worry 
Changing your antivirus application never means the discarded AV is crap or anything,A Great AV is always great irrespective of its user base…avast is always been great and this fact doesnt change in any of my cases 
I think the statement for most of malware fighters and AV companies should be:I am fighting to beat malware and not to beat another AV.