It really depends onn the quality of the hood. If you are buying an ebay hood then I would put pins on it. If you are buying a quality seibon or vis hood you probably won't need them. I have a set that I bought for my seibon hood, but don't think I am going to ever install them because the latch seems to be really strong.
is have the Vis OEM CF hood. had it on about a yr now. Most of my driving comes from highway driving around 80 mph. Yeah the hood bounces a little bit (just enough to see it) but it doesnt show signs of coming off. Ive been on 400+ mile trips on the highway with no issues and i check the latch every now and then and it shows no sign of cracking. I just cant bring myself to put ugly looking hood pins in the hood. If u have quality u shouldnt have any problems, just check on it once in awhile to make sure all is good