Unfortunately, PLEX tokens cannot be mined. They can only be minted during the Pre-ICO and ICO.
Is this a security token or a utility token?
It's a utility token
Will the marketplace show the products cost in USD/ GBP or Plex tokens? Sorry if this has been asked earlier.
The marketplace has several currencies to display prices in. These range from local currencies to cryptocurrencies. Its purely down to user preference. All payments will still be in cryptocurrency though.