Actually i always see a lot PvP ppl whine that they cant earn enought money.
There i also no need for a credit sink. You can buy ships and modules and engineer em that alone will cost a lot money.
If you have the right ship and rank you can make 10-15 Mil per hour and maybe sometimes even more without using exploits.
Also player market is a bad idea that ruined a lot games. In this game this will lead to pay 2 win and selling Credits for real word money.
With that the open option will be even more less used then now, because the players with the most money can play around much more with engineers and get better stats, then someone that just cant afford the materials.
It would not affect me since 98% of the time i play solo anyway, but surely a lot players that play in open.
With the insane prices later on specific materials, new players can sell thouse and instandly buy big ships. Thats ok for me but they will miss a lot nice ships experience to the way to the big ship if they would just play normally.
The next problem would be the trading elite rank would be expoited by high prices sales.