Here's my 2 cents, but for you, it's free.
Part 107 flying - it's required. You are running a business. This is one of the easiest and cheapest business regulations to meet that you will ever see. There is no excuse for not complying. I was shocked that they didn't crank up the cost and red tape if you are running a business, but let's not give them any ideas.
I understand the kneejerk reaction most of us have when we suddenly become required to register and provide information to the feds for activity that we had been doing for years without the requirement. It actually is an encroachment on freedom. But I guess since we have always had to register our automobiles, buy hunting and fishing licenses, etc. so those don't sting as much. It theoretically would give a tech savvy serial killer who hates drones the means to find out where you live, but every activity requires a risk and in my opinion this one is pretty low.
So I asked myself what's the point of all this. My speculation is that they felt that they needed a way to identify the small percentage of idiots who feel that they are entitled to do whatever they want, whenever they want. Of course these are the same people who would never even consider registering. The rules do not apply to them. They probably have no idea of what RID is, nor do they care. So imagine some jerk is blatantly violating the law, and genuinely being such a menace to aviation that he attracts attention to himself from people who care, and are tasked with doing something about it. He may not have registered, but he did have to buy the drone. Whether he knows it or not, he is broadcasting more than adequate information for the authorities to locate him and put a stop to his nonsense before he hurts someone. That's a good thing.
It may actually deter some would be idiots to modify their behavior or just stop flying altogether. That's a good thing.
Imagine you are out acquiring footage of landscapes or sunsets in your unregistered
mini 4. A cop sees it and comes up to you, weighs your drone on a recently calibrated scale that finds that you are 2 grams overweight. The chances of being charged, hauled in to court, and fined 27K are less than zero.
But, say a cop does approach you and you have not been doing anything wrong. If you have that sticker on your drone, and you explain to him that you are fully registered even though it's not required because you are under 249 grams, and you have your trust card, the next thing you are likely to hear is "have a nice day". Let's be honest, to 99% of the public, the mini looks like a toy drone.
So if you decide to go ahead and register, this may take away one of the biggest positives for buying a mini. You may want to think about looking at some of the other incredible options that are out there. But whatever you decide, you may want to pull the trigger before the end of December. There is a real chance that new Chinese drones may not be available to purchase after that. Best of luck to you.