I recently bought a website from Flippa. I've getting search on some long tail keywords daily and it accounts for good chunk of organic traffic.

I was curious about the number of searches for such long tail keywords, so I decided to check the amount of traffic I should get on Google Keyword planner. For all the long tail keywords Google shows only a search of about 300/month but my website has been getting 200-250/day.

Could GKWP be that off?