I would not call it a waste at all. Think about it this way, if you plan on playing Battlefield 4 with your current setup and can get an average of 60 fps on the max settings on a 60 hz monitor, wouldn't that be great. Even if your system could push the fps to 70 fps on max settings, you are only losing 10 fps. I don't know how much fps your system can do on that game, but unless you know for certain that it is well over 60 fps consistently, then I don't see any reason to upgrade to a monitor that offers the ability to see those extra fps.
And are you certain that you can actually see a noticeable difference in the higher fps. Many people cannot tell a difference. And while you say that you are playing mainly Battlefield 4, isn't the next Battlefield coming out soon? How many fps do you think that you would get playing that game with max settings? Maybe less than you currently do with Battlefield 4, so even if you could get 70 fps with #4, but will only get 60 fps with #5, wouldn't that take away from the whole point of upgrading monitors.
Leaving the arguments aside of how many fps your system can push and the one about whether or not you can actually see the difference personally, we are left with a bit more to consider. Such as, do you have it in your budget to switch monitors right now, or sometime soon? Do you really consider it worth doing, and would you then plan on playing with a multi-monitor setup? Because you would probably lose fps if you did that.
I am assuming that you are just playing the game for fun, and not being super competitive or doing it professionally, so that is another reason that you don't really need to upgrade your monitor. Professional players better monitors because literally every frame helps, that means a fraction of a second sooner you might be able to see the enemy and take them out.
If you plan on playing other games, or don't mind turning down the settings to get that 144 fps or higher, then by all means go for getting a new monitor. But I personally would stick to what I have for a while if you are happy with it so far. For my setup, I turn on VSync and have a LCD tv that I use for gaming. It is only 60Hz so I just max out the games and let the fps hit 60. So right now I am playing through Tomb Raider (already rented it at release on the console, but picked up the PC version from Steam a few days ago). I am playing with all of the settings maxed out and the benchmark test shows my average of 60 fps when VSync is on. That is great for Tomb Raider, but some games I play I know that I would easily hit 144 fps with the settings maxed out, but am limited by my tv. Sure I would like a nicer tv, but there will always be a nicer one to game on, so I just stick with the one I have and know that while I can max out the games right now at 60 fps, I will be able to do that for the next few years easily too.
You can always be chasing the next big upgrade. Even if you upgrade your monitor right now to a better one, you might end up wanting to upgrade your GPU sooner with the argument that you could get more performance out of your monitor. And that might create a cycle of upgrading. Not saying that is bad, but just another potential point to consider. Sorry to be so long winded, but it comes down to this: If you are happy with the settings and fps you are getting right now, then I would not worry about upgrading. And the longer you wait to upgrade, the cheaper and better the upgrades can become.