I don't think the market of people buying used phones for the purpose of graphene is going to make a dent in profits for Google. It raises resale value maybe by say, $0, considering the price is set by the average consumer
> If anything there fast reduction in value makes them less attractive.
Right. And if you buy a secondhand one you are increasing their value on the secondhand market. Reducing the depreciation increases the value of the brand new phone.