I'm not a native English speaker, so I don't know what to search for on Google and similar.
In chats I often read words like 'helloooo', or 'sureeee'. And as I understood it, it's meant to mimic the sound of the spoken prolonging of the word. But I always wonder why people don't write it like: 'suuuure' or 'heeello', as this at least is how it sounds to me.
Is it a personal matter of habit? And if so, why is it that most people seem to use the first form?