CoinmarketAlert will help investors before investing. I think this is a great step and will be a great project. I found it more attractive.
The project will help not only to future investors, but also that who has already bought any coins and waits for them growth. In this case coinmarketalert will send the notice to email and the investor will be able to make the decision on sale of these coins.
I agree with your point. Tracking those investments needs a lot of time because you'll be spending most of your time watching the prices goes up or down. But it will be much easier now if this project will be implemented.