I can answer this in regards to mining:
Because there is no point in it.
The income of most mining is directly tied to everything created through minerals. The average value of the earnings of a miner is always the same. Always. No matter if Trit costs 5 isk, or 10 isk, the buying power will always balance itself out again. Simpletons might believe that “a higher number means I am richer”, but reality says “No”.
Imagine CCP decided to put in some mechanic that doubles the price of Tritanium.
When Trit starts costing 2x more, the miner earns a number that is two times higher. Simpletons believe “wow, I earn SO MUCH MORE!”, but in reality everything he buys (that is made out of Trit) will cost around 2x more. His buying power effectively stays the same, and he will whine again that he does not actually make enough money.
There is no point in boosting mining, because it changes literally nothing in the long run.
This case, here in this thread, is actually the opposite. Miners mining more would lower the price of minerals, because then more minerals would be flooding the market, causing prices to drop, causing simpletons to believe they are making less money. Not to forget the negative consequences it has for the economy when everything gets too damn cheap.