Because neither side of the equation is recorded. The effort lives in a project tool or nowhere at all, and the return is measured in sessions.
So the return on investment is asserted by whoever wants the budget and doubted by whoever holds it, and neither can settle it.
SEO work is tasks in Loop with logged hours, each linked to the page records it affects. Those pages carry their impressions, clicks, leads and invoiced value.
The comparison is cost from timesheets against revenue influenced, for the same pages over the same period.
It will not isolate SEO from everything else. Brand, product and seasonality all move at once, and Growth reports the sequence rather than claiming the mechanism.
It also will not forecast return on work not yet done, beyond a range from your own history.
The conversation moves from belief to evidence. A quarter's work cost this many hours and the pages it touched produced these enquiries and these deals.
It also shows which kinds of work pay: metadata fixes on earning pages often outperform new content, and the record says so rather than the opinion.
Yes, where it is logged against the tasks.
Reported over the window you choose; the lag is real and visible.
Yes, by task type against the pages affected.
We will run it end to end on your own numbers in half an hour, and tell you honestly which parts Treepie does not improve.