Seats are for any user of the UI and they aren't bound to a person, so you can reassign them as necessary.

For larger teams we do buckets of seats with price reductions per-seat as the team size goes up.

We don't rate limit deploys - as that would make you less agile, we don't charge based on resources because that penalizes teams with stable infrastructure.

We know ops budgets can be tight, we're ops engineers, so we try our best to make the pricing work well for those budgets.