Most common reason? Mixing up national vs local volume.
Here's what happens:
You check the Search Volume Estimator and see 3,000 searches
You get excited and launch your campaign
But wait... that was NATIONAL volume
Your campaign targets a specific city
Actual local volume? Maybe 50.
How to avoid this:
Always use LOCAL targeting when checking estimates
Make sure your geographic settings in the estimator match your campaign
Aim for 200%+ of your daily target. If you want 50 leads/day, target keywords showing 100+ volume.
The estimator shows the last 7 days of captured data. It's a solid indicator but consumer behaviour fluctuates. Holidays, seasons, news events... all affect search patterns.
Use it as a guide, not a guarantee.