I'd like to increase the profit rate of the event.
what about 6x profit?
Yes why not sounds good.
But maybe also increase the time from i think now 18minutes to 40 or 60minutes.
Or in general increase normal price of goods by by 2 times.
If you really want to see players joining events you have two options which are:
1. Limited number of events but with great rewards
2. A bunch of events with small rewards but if a player is joining most of the events will have a great total reward.
at the moment not because it is not worth it.
But if price of good would raise a little maybe.
Otherwise i usally try catch every Trade Profit Event, but as i said 18min time for event is very very little.