It's more of 'is this user important or not', a lot of people are serious.
Serious / important people:
conspirosphere.tk
PsychoticBoy - runs ABM
usagi - ran GLBSE funds with questionable practices, silver asset is pretty legit
TradeFortress - btcinvest looks promising
Deprived - very active in the securities section with high quality contributions
MPOE-PR frequently trolling but you're stupid if you ignore her
Namworld - runs various high quality assets (except BTCMINING which loaned out their coins during the period where loans were like the mortgage bubble)
Totally ignore because troll
Monster Tent - "P.S. In almost all cases where someone uses a woman as their forum avatar they turn out to be a scammer. " LOL
Just irrelevant (/ not important)
The people here aren't people you should ignore - a lot of people here trade bitcoins, buys assets, et cetra but they're not really people I consider important.
Tritonio
marketersales - asks for loans and lawns straight out of newbie queue
regular
camolist - not important
stochastic - lots of posts, doesn't matter
viboracecata
Bitinvestor
dishwara - not important, he did run the DISHWARA asset in a pretty joke style
Undetermined
WinTame2012
Post an address and claim your prize.
Not quite the rankings I'd give. I'd throw some people in different categories. Still, it seems like you put some effort into it.