Related questions:
1) Why didn't James' love and sacrifice for Lily protect her?
2) Would Neville Longbottom Have Survived If Voldemort Had Marked Neville For Death Rather Than Harry?
It has seemed evident that the Order would rather capture than kill - especially Harry - as he himself says in the Battle of Seven Potters. So, it is safe to assume that all the Death Eaters will always be given a chance to live. And given the answers in Neville's case - it seems that Neville was expected to survive at least the first attack.
Now - in Goblet of Fire - Barty Crouch jr exclaims:
"Tell me he told them that I, I alone remained faithful... prepared to risk everything to deliver him the one thing he wanted above all... you"
On another occasion - in Half-Blood Prince - in Spinner's End - Bellatrix claims that she would've given up her sons for the service of the Dark Lord
"You should be proud!" said Bellatrix ruthlessly. "If I had sons, I would be glad to give them up to the service of the Dark Lord"
Assuming the same ruthlessness will hold true for herself rather than her sons - If Bellatrix - or Barty Crouch jr - had sacrificed themselves for the Dark Lord's cause - would he have survived?
Specifically - Does the nature of a person's sacrifice affect the protection? Will sacrifice out of fear or dedication to their master provide a similar protective shield - even if it might be weaker?