But I don't think any of the forum users would hold a share big enough to influence the prices.
I dont agree with you, This forum is so popular that 99% almost every bitcoin user or knowing about bitcoin and crypto currency will be in this forum. As they can gain full knowledge about the latest information on the market and here you can get lot of marketing benefits to promote your products. You can see lot of sites who are conduction signature campaign and some of them are permanently running their campaign, as they are getting lot of business through this site. And even big players are also here who are keeping knowledge of market so that they should not get stuck in manipulating in the trading market.