I love Indigo, and how it works.
However, some of the plugins aren't as stable and/or user friendly. Not complaining, I know the plugin developers aren't being paid for it.
Honestly, I would rather pay for my plugins. This would give the ability for users to get better service, more stable plugins, and timely support.
I think it would also incentivize some potential developers to create/improve plugins.
Maybe a free and a paid version of plugins.