What gives?

I have started to focus my collection on obtaining a proof and mint set from each year. When I receive a set, I add the set and then individual coins from that set into my database. I was going thru the 65th Edition Red Book to see what the 'going prices' were and was somewhat confused on the pricing.

1966 Special Mint Set: $8.00

1966 Kennedy Half Dollar MS63: $7.00

1966 Washington Quarter MS63: $1.00

1966 Roosevelt Dime MS65: $1.25

1966 Jefferson Nickel MS63: $0.25

1966 Lincoln Cent MS63: $0.20

Total Coin Value: $9.60

1980 Proof Set: $7.00

1980 SBA Dollar PF65: $8.00

1980 Kennedy Half Dollar PF65: $4.00

1980 Washington Quarter PF65: $3.00

1980 Roosevelt Dime PF65: $1.50

1980 Jefferson Nickel PF65: $1.50

1980 Lincoln Cent PF65: $2.50

Total Coin Value: $20.50

What sets the 'Current Value' of proof and mint sets? I would think that the current value would be based off of what each coin inside could be valued.

Yes, I know that not all coins are created equal. Some coins in a proof or mint set may grade lower or may grade higher.

Also, what makes a 1984 Kennedy Half Dollar PF65 priced at $6.00 when the 1980 (older coin) is $4.00. They are made of the same metals.

When buying a set, do I base my price off of what the Red Book tells me the current value of the set is or base my overall price on each coin in that set?

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