When BTC price reaches $7k and 1 credit equals 0.001 Sat, I'm afraid we'd all leave the site!

In order to not let this happen, the amount of earnings should increase when it's value decreases.
Example,
When 1 Credit =
0.0964 you earn
13 Credits from Cash Link
When 1 Credit =
0.0664 you earn
19 Credits from Cash Link