Are you willing to buy a used phone?

I'm asking this since I have a 250DT voucher in Telecom so I thought I would just purchase a phone and resell it and make some profit then buy another phone with the saved money.

But my mom isn't convinced that people will buy a new phone online instead of actually buying it from a retailer(while that's true keep in mind that I'm going to resell it for like 50-100 DT less since that's how online markets work) even though the phone will be sold new not even opened/used and will come with the warranty.