Don't get your hopes too high when promoting bounty projects especially bounties with very high allocations like in millions of $$$ ,they are never the same again unlike in the past ,all you have to do now is just depend on yourself and promote good projects and wait for end results.
Yes, those that promise millions of dollars can be quite misleading. This is based on a) the ICO hitting hardcap, and b) the coin maintaining its ICO price once it hits exchanges. In practice 'a' happens quite rarely, and 'b' hardly ever.
It doesn't mean it's not a good project, but just that the rewards in dollar terms are generally quite low these days. You will tend to get a smaller share of coins because it doesn't hit hardcap, and thenn the price usually tanks on exchanges.
Bounties are better if you go only for good projects, and think about them as long term bets.