Hi I have 5-7th position in google's serp on 1 keyword that has 1.000.000 local searches (checked in adwords.google.com/select/KeywordTool). But I have only 5-10 visits a day from this keyword. In google webmaster center I dont see even this keyword in stat.
Did you remember to change match type to 'exact'? These days Google uses geotargeting and multiple data centers. So you might not have that ranking everywhere. Also, the real traffic is in the top 3 positions. For some keywords the lower ranked sites get very little traffic. Click through rates are also affected by things like the title, description & url.
Using "exact" matching i see 200.000 searches for english, all countries. 200k searches is 6000 searches a day. So I should have at least 2% of traffic (100 UV). I checked serps via many IPs and I was in TOP10, now I have stopped linking this keyword. This keyword is "online stock trades"
I am getting same experience with some other keywords. Keyword tool says there are millions of searches per month, I am number 1 and number 2 for those keywords, yet I get only few thousand visitors per day
Well I checked the number of searches under this configuration; English, USA, Exact match and got the 27000/month figure. No point in searching global unless you are really ranking in all the SERPS. Focus on the states or the UK or Canada or whatever. So 2% of that it's only 22 people a day in the US, I'm not surprised you get so little visitors. Hit that top 3 area and you should be good mate.
Yep top 3 is where the traffic is at. For most keywords the top few websites take a large percentage of the traffic.