We are already planning to add market tiers for 1k, 10k, 100k, 1M markets. Will we add 100 mana as a tier? (Or any amount less than 1k?)

I think this could unlock a huge amount of activity, similar to Manifold before the cash prizes pivot. Users could create lots of fun and niche markets. We'd get more trades, comments, and markets shared. I've heard from several creators that the high market creation cost is meaningfully dampening how many questions they create.

One downside is traders would have to adapt to markets with low liquidity. We'd probably change the bet buttons to default to 1/10th their current amounts for these markets.

Another downside could be lower-quality markets. Is it good to host these on our site?

Lastly, from a business perspective, it could be that people would create more 100 mana markets instead of 1k mana markets, and thus buy less mana, decreasing our revenue.

Personally, I think the greater content and activity that results from this change would increase revenue in the long run, but I'm not sure.