Interesting.

I guess it'll even be more unattractive to crack if large amount of bitcoin is split into smaller amounts (also offers better decentralization).
Coin decentralization or splitting of large amount into small amounts is indeed a good thing. Fees has to be considered though.
I think people who attempt to crack cheap private keys, will eventually understand it's a waste of money, energy, resources and time.

 Seems like you didn't do all of your homework.

  The compressed WIF is a base58 encoded version of the private key to which superfluous data in the form of a leading network byte and an additionional x01 plus a 4-byte checksum suffix are added before the conversion.  There weren't 14 unknowns for calculating the private key - I would guess more like 7 or 8 unknowns.


 Random private key - 5BB6F9F60C4895ED1633996AF36512B95C4CACC801649898B828587010407F05

Compressed WIF - KzHzWbfHQk9QKWwY3yMjWGvWXuWGHDB7qjoDdA5YndCcbTUx1aFn

Compressed WIF decoded to hex - 805BB6F9F60C4895ED1633996AF36512B95C4CACC801649898B828587010407F0501BFAE1BCD

The first byte (80) and the last 5 bytes (01BFAE1BCD) are irrelevant to the private key itself:

Change the last 5 bytes to 0s
805BB6F9F60C4895ED1633996AF36512B95C4CACC801649898B828587010407F050000000000
and convert to base58 -
KzHzWbfHQk9QKWwY3yMjWGvWXuWGHDB7qjoDdA5YndCcbTHWJdNw
KzHzWbfHQk9QKWwY3yMjWGvWXuWGHDB7qjoDdA5YndCcbTUx1aFn <--- actual WIF compressed of the private key

as you can see, there are 6 characters that aren't required in order to find the private key in this particular case.

 We need not worry about supercomputers or quantum computers unless we're going to publish our nearly complete private keys' WIFs online.  I think, if we can refrain from that, our funds will be SAFU.



 

This is the right answer. You only need to brute force 8 characters here to be able to derive the entire private key. Given that WIF keys are in Base58Check, then the total possible combinations is 58⁸ = 1.28*10¹⁴. Given that we know there are GPUs which can generate over 2 billion keys per second (2*10⁹), then that number is potentially brute forcible in as little as 64,000 seconds, or about 18 hours.

As a contrast, to brute force 45 characters of a compressed WIF (52 characters minus the last 6 and the first one, which will always be "K"), the total possible combinations is 58⁴⁵ = 2.26*10⁷⁹, so a difference of over 10⁶⁵, which turns the 18 hours above in to trillions upon trillions of years.

Well OP used a compressed private key so luck wasn't at play in my choice of WIF.

Edit:  damn I hate posting from my phone. Had to fix the formatting.