This forum is also read by many investors and analysts. Therefore, the bounty campaign is effective in promoting the token.
Also an important part is advertising in other places.
Yes, you are right. Whoever expert in crypto investing they mist follow and read this forum before buying any coins! Therefore all the well-known platform like Coinmarketcap, Etherscan asks Bitcointalk ANN thread as a reference! So, Signature bounty helps to catch an investor's eyes! Therefore social and content bounty increase the community and activity and it spread widely! So, the only bounty is not enough but it promotes a project widely!