Manifold is thinking about letting users pay to promote their markets at the top of Browse. See this proposal for a rough sketch of what we're thinking about.

Thirty days after we launch some version of this idea, I will start the clock for another 30 day period. I will then the sum of all boosts sold in this period to resolve this market. If a boost costs $100 and a user pays in mana (Ṁ10,000), I will count that as a $100 transaction. If we don't launch a feature like this in 6 months, this market will be N/A'd.