>>12732173
Wrong. Nurgle does love his followers, and Nurgle belives his curses are blessings.
He's not evil, he is twisted, to quote the codex "their cries for relief are like the laughter of loving children" to him.
>>12732143
Yes, the Chaos Gods are capricious, but your view of favour is different from theirs. Only the most deluded and insane chaos marine wants to become a Chaos Spawn, but even Chaos Spawn have been said to be loved by their patrons and favored by them (there was even a named one of Nurgle somewhere that he loved).
Even so, their favor isn't as random as you think, for just like you say, they don't throw away those useful to them, and those champions, including non-marines, who prove themselves over and over generally aren't rewarded with spawndom, but something much greater. The Greatest of Khorn's Princes was, and still is infact a normal man, who was never a marine or a primarch before his acention. But the piftiful low life scum? You're right, they're no better off than a servitor, and the Emperor still doesn't protect the conscript. But atleast they don't worship blindly like prayer servators (they actually exist).