The question you ask about it getting easier, is hard to answer. That method by itself wouldn't benefit someone. It could be used as one tool among others to help predict. Another way could be to use that info and create a visual chart, which could improve the prediction method. Visuals always help indentify the flow of the daily fluctuations that much easier.
Out of the many systems I've aquired over the years, i must say Steve Player's "prime line system" has been the best. It teaches you how to read the daily activity almost in real time. You can easily scan a month's worth of info in seconds. Like rewinding a tape back and watching the video again.
Other methods can be found if you do a search. There are many many more.
I haven't found the perfect mix of tools to make a living with the p-3. I have my eyes on a dog racing system I'll be buying in about a month or more. It costs 2,000 bucks. I have a thread about this in the gaming forum.
Once you do a search, you'll find a plethora of info including but not limited to, odd/even.......high/low.........frequency........and the list goes on........
Hope this helped.