My answer is Yes! It helps in ranking but as you said the traffic for that keyword is very high so it will take you to work very hard. Let’s assume if you have only goal to rank on that particular keyword you can go for it or there are lots of an alternate options for you, instead of selecting keyword targeted domain you can go for business oriented domain which will help you in long run. If your plan is for long term goal just see your self, if everything is under control go for keyword targeted domain.
My Best Tips For Ranking: .com Domain (know as Top Level Domain) which gives you more power than .co.