KB refers to kilobytes. The amount of space the tx takes up in the blockchain not the amount of bitcoins transferred.
The size of the transaction is determined by the number of inputs and outputs. A typical transaction with 1 input and 2 outputs is about 226 bytes in size. So 0.00422465 btc/KB will result in a 0.00093 btc fee for a typical 226 byte transaction.
There is an image here that will go some way towards explaining what an input and output is:
https://bitcoin.org/img/dev/en-transaction-propagation.svgIf you have a lot of small inputs like small payments from faucets then that can result in a large transaction with high fees.
Since the bitcoin supply is fixed when some people lose bitcoins it means that all the remaining bitcoins become that much more valuable.
Thanks, really appreciate the reply. However, if 99% of the people no longer have access to their bitcoins, then doesn't that mean that there are fewer people who will accept bitcoins to buy stuff? I doubt that if 1 bitcoin is left that it will be worth billions of dollars and everyone else will then share fractions of a single bitcoin. Maybe I'm obtuse but it's pretty counterintuitive.