[Supaman771]

Trials can't join gangs (or even parties) for a reason, there has to be incentives given upon upgrading.
Top party would be lame and detract from gangs.

Bases taken couldn't work with the current system, cause any 2 people can create parties and abuse it.
Also a ton of things would need to be added, so players can't just play ulms endlessly or lame noobs all day.

In the end, it would be more work/effort than it's worth. Just get better and join a gang.