Maybe nowadays Bitcoin campaigns are coming up more often but don't forget that this campaign is running for very long time and if I am not wrong since from 2014 so some people love to stick with the long term campaigns instead of moving to campaigns every week just because they get few more pennies.
I'm part of the campaign for over a year I just left after the payout issue, it's true there are people who want to stick to a long term campaign they don't want on a short term campaign because you are competing with a lot of members, on BItvest and 777Coin you just need to concentrate posting and never worry about campaign ending, I thought these two campaigns will last for several more years because the market is getting better and both casinos are doing great.