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Some of those requests are very important and will benefit with actual real monetary results

That has nothing to do with agile. That's a basic failure in product management, and would happen regardless of the dev methodology.

If those features really do have such a large business impact, they should be getting prioritized (hint: the backlog isn't a rigid, time sequenced FIFO).

If they're not, either the PO sucks, or the features aren't as important as the sales guy thinks relative to other items in the backlog.