Don't fall for it.
Chances are, the Gearhead is compensating for some other pitfall by drowning himself in new purchases. You do not have to buy into every craze that comes along. It goes for equipment, it goes for training, and it goes for techniques. Think your way through. Ask questions. Learn.
For example: On my AR, I use a pistol grip with interchangeable palm and finger swells because I have big hands and it prevents me from over indexing the trigger.
I purchased a particular piece of equipment to address two issues I have. That does not mean you should immediately go out and spend $40 on a Magpul MIAD grip. Yes, the MIAD is a good piece of kit. But if you don't need it, wouldn't that money be better spent on ammo or a training class? Don't fall into the financial pitfall of keeping up with the Gearhead.
I'm also not big on buying the first of anything that comes out. Often, manufacturers are in a hurry to release that new product, and sometimes they still have some issues to work out. How many times have you seen the phrase, "Gen2 model with the following improvements" in an advertisement or review? Let the Gearhead work out the bugs for you, and then spend the smart money on the upgraded version- or snatch up the used first model cheap!
Y'know. Unless you're independently wealthy, a lotto winner, or just have to be "that guy"...