Its not that they put pine tar on their helmets on purpose. Its from handling the bat with their gloves, then both adjusting/taking off their helmet. So it just transfers from bat to helmet via the glove. Sure they could clean their helmets after a game, but I'm sure its a superstitious thing with many Baseball players to not clean the helmet. I'm sure you've seen tons of ball players with extremely dirty helmets...
Also... ball players ''adjust'' the amount of pine tar on their gloves for preference by touching their helmet to take some of it off.
The reason why Major League Baseball players touch their helmets is because they use a substance called Pine tar, it's a sticky substance that looks kind of like mud in a way. Players stick it to their helmets so that when they go up to bat they have some to grab to put on their batting gloves because Pine tar is designed to help keep a better grip on a bat.
Pine tar is sticky and helps them grip the bat.
Baseball players use pine tar for more accurate grip when they are batting.
It aids in the gripping of the bat, also it is referred to as "pine tar"
football players put air in theIR helmets because it is used to fill up space if the helmet is too big or some helmets have special pads that blow up that are more comfortable
for grip, so the bat will not slip out of their hands while swinging
Pine tar is very sticky and allows the batter to get a better grip of the bat when they use it on their batting gloves.
in college they put the symbols on their helmets for great plays or game making and breaking plays