Because you can't extract leads that don't exist.
If the estimator shows 10 searches for your keywords in the last 7 days, don't expect 100 leads. The math doesn't work.
Rule of thumb: Target keywords showing 200%+ of your daily lead goal.
Want 50 leads/day? Target keywords with 100+ daily volume.
Want 10 leads/day? Target keywords with 20+ daily volume.
If volume shows 0? Pick different keywords. That phrase isn't being searched enough in our data sources.
This isn't a platform limitation. It's reality. No leads exist for terms nobody's searching.