What is the differenec between these two boards (apart from the fact that one costs money to use)? Are they actually separate?

When I first signed up at the 'other place' i joined the free bb.
I quickly realized that i wasn't going to learn much there as there were too many idiots posting and cluttering up the board. I changed to the 'premium' board where the posters were more experienced and serious (apart from a notable few).
On this site however the posters on the 'investors' bb are quite civilized and experienced so although i have been a beta tester on the 'traders' bb i didn't feel it necessary to renew when MAM finally asked me for monry.
I think the only difference is that the contributors to the 'traders' bb are prepared to pay the 5 pm fee and us 'investors' aren't.