Well you can't earn more in signature campaign with that kind of ranking you need to get to full member to earn more on signature campaign, then if you have that much bitcoin you can surely can join tradings,
not to emntion right now, you cna only do 0.5 btc per month even with legendary status, so not really that great to be honest, it was better in the past
but it is still the less worst method to earn besides buying...
And working in the signature campaign is easier than working in an office and get a little more so, although only 0.5 / month is more than enough.
Yes, it really depends where are you from, but even if you live in a rich country where 0.5 BTCs is not a lot, this amount is still a nice reward for posting on the forum, helping people and engaging into discussions.