greedy smokers

I understand that when your sparking someone up you wanna smoke as much as you can. However I have come across smokers who are just plain greedy. These guys will smoke your bud and then when they roll something they'll smoke like 3/4 of the blunt by themselves in one rotation and then pass some little roach for the other smokers to hit like if they only deserve the scraps. I have actually kicked people out of my house for this. My brothers co worker always did this. He would always come by just to smoke our bud and then take off before anyone asked him to match. And when he did finally match something he would roll toothpicks and smoke most of it by himself. At first I let it slide cause it was his bud so I just stopped smoking mine with him but then he would come by and buy like half an O and still be stingy with it after my brother sparked him up eventually he pissed me off too much and I told him off . I no longer have the patience for this type of smoker.