JohnD

The price of hell is so high because of what Jesus had to do to save any of us from it.
Every knee shall bow and every tongue confess that Jesus Christ is real, he is true, he is savior, he is Yahweh (LORD),
he is the victor over death.
All doubt and unbelief dispelled for all eternity.
Answer to part one of your question:
Yes.
Conversely we who are saved will know we don't deserve it!
Answer to part two...
The greatest hell would have to be knowing beyond the shadow of a doubt how little was required of them to have avoided hell completely.
John 3:16–18 (AV)
16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
18 He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
Ephesians 2:8–10 (AV)
8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
9 Not of works, lest any man should boast.
10 For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.
1 Corinthians 15:1–4 (AV)
1 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
4 And that he was buried, and that he rose again the third day according to the scriptures:
All they had to do was believe. 
Some theologians speculate this is why there is so much agony like hellfire, as a grace on the part of God to distract from the absolute hellfire within.
Ask someone who missed the deal of a lifetime, or who did something stupid that cost them everything in this life, or someone with OCD. The mind and spirit can be a hell that would put Gehenna to shame. 
 
 

Colossians 1:12–16 (AV)
12 Giving thanks unto the Father, which hath made us meet to be partakers of the inheritance of the saints in light:
13 Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son:
14 In whom we have redemption through his blood, even the forgiveness of sins:
15 Who is the image of the invisible God, the firstborn of every creature:
16 For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him:
 

Jesus (Joshua) in the Hebrew Yehoshua,
YHVH (the name of God, i.e. Yahweh, Jehovah, transliterated LORD / ADONAI, lit. "HE IS" derived from "I AM" 'ehyeh asher 'ehyeh
HOSH root for save / salvation / savior in several Hebrew names Hosea, Hoshea, Joshua
Immanuel (God With Us) is a description more than a name,  he shall be called wonderful counselor mighty God everlasting Father
You call you Dad Father, and in a sense that's his name but it's not his name on his driver's license.