Here is the situation:
I am a member of a business class team with a couple of boards.
I've created personal boards for other purposes not linked with the business class team, in which I will add some external people (within the company and outside the company).
I see that my personal boards allow me to use 2 power ups (Voting and Custom fields), which I used. (This features sees to come with the business class thing, be able to add 2 power up)
When sharing this personal board with external members:
Yes, the ability to enable unlimited Power-Ups is a feature of Business Class. You'll be able to do that on any boards in your BC team or personal boards.
Any other members in your Business Class team will have that option as well, however a member that isn't part of that team will not.
There aren't any hidden costs with enabling Power-Ups, however some are connected to third party services that have their own subscriptions. In order to use the Power-Up in a case like that, you'd need to have a subscription to that service as well, if it is required.
If you were to cancel your subscription, or you left the team, you'd lose the ability to enable unlimited Power-Ups, and Trello would disable those on your boards. The data from them is still saved, so nothing is lost and you can go back and reenable any one of them.
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