The increase the cost of equipment and similar balance proposals may lead to increased pirates demands and in consequence make things worse.
Tightening restrictions for traders for sure won't increase server population and won't convince new players to RP. Strict rules never works on places where people come to have fun.
Most of those silent traders are fresh players which want to make money to finanse their chars and ships. After they become rich, they may start to think what to do with their money and eventually they can find a potential of RP.
Veteran players have huge pockets with billions of credits, we are free to make any char and to buy any ship. trading is not only for money, but mostly for faction RP. And even greedy demand of 20mil can be covered with no big pain.
For new players credits are paramount. If it is too difficult, they simply give up and resign.
Patience, forbearance, resonable demands and quality of RP make much more than restrictions and sanctions.