What does a stutterer lose the most?

I remember a joke that there was a stutterer in the countryside who was thirsty after entering the city. He saw a soda seller on the roadside, the kind in bottles. He walked up to the crowd, pointed to the bottle and asked, "How much is it?" He doesn't stutter because he talks less. The stall owner said, "2 yuan a bottle." He said, "I want to drink ... I'll drink ..." The stall owner listened and opened a bottle, but the man said, "I can't afford it."