An easy way to make a lot of money pre level 70 is to farm lost mines elite and spam it. It drops a lot of gear which can then be disassembled.
Although you will get gold from selling the gear, it's possible to obtain poc from disassembly which can be sold for 1k per 1 poc. This eventually adds up to more than just selling the gear itself as you will make 3x+ more profit.
Hope this helped!