so basically no point in having more than 4-5 friends.
no because you don't know what kind of gift they will sent you. Of course there is an option to send them first a variety of those 4 gifts and they reply them back (that's the point when you see that comment - sent the gift back) but you don't know if they 'll log in that day.
I have some friends who log 1-2 times/week and some every day.