And it should be the size of a thimble ... but because it's so easy and accessible all the time ... we just keep pressing it over and over and over again.
I think that eventually one can get bored with those instant small droplets of dopamine as well, readily to be experienced 100% of the time you hit that button.
After all, I've heard that we get more enthusiastic about the random chances of either receiving or not receiving dopamine.