Don't Add me : If you try to scam.
Don't Add me : If you beg for free items ( I choose when and to who i will give some free items)
Don't Add me : If your profile is private.
Don't Add me : If your inventory is privat or empty.
Don't Add me : If your account have Trade or VAC ban.
If I delete someone, that's why we don't play active games together or active trading.
I clean friend list from inactive users every 20 days. So, it's nothing personal.