Doesn't change the fact that the ARRL doesn't own those frequencies. It's commonly recognized that they use them and yep, you are welcome to interpret how they use those frequencies as not being ham friendly.
Do they monitor? I honestly don't know. I do know that literally thousands of people monitor those frequencies attempting to improve their skills by trying to determine what the folks at the ARRL are sending out at the scheduled days and times. This suggests that there are probably a good percentage of them who are going to be less than impressed with you deciding to start transmitting something on those bands at that time. Liable to get one yelled at I would think.
The ARRL could be transmitting these in some of the short wave broadcast bands instead, though that would probably require a different license I would think.
I would honestly suspect that there would be more complaints about your operations on those frequencies than other complaints that the ARRL was interfering (deliberately or incidentally) with your operations. I'm not saying that those complaints would be right, just that the complaints would not be purely against the ARRL.
Of course it's pretty simple to locate where the ARRL is transmitting from, they publish that information. Making sure where the other party is working from would be a different matter. I suspect that that is really what the person who started this topic wants to delve into. If you are practicing by sending your ID in code, on a cw frequency, I would tend to suspect that the challenge of a fox hunt would be of little interest to most people. On the other hand, if you are sending out random psk, random id's in code, or transmitting ssb at 1500 watts on the frequency, mobile, that might be a bit more interesting to a lot of people. It would also tend to suggest that you are more interested in being disruptive than that you are innocently using a frequency you thought was not in use.
I guess that would be sort of like trolling on a forum to get people off of the original topic. Wouldn't it.
73,
-Rusty - kc0vcu