This will Hurt

A licence (license for our US friends) grants you the right to use the software for as long as the licence allows - usually indefinately. If I return the software and materials should I get a refund - no you have opened the licence the materials are merely means of you getting the benefit of the licence. You don't own the software that is held by the software company.

Using cars as an alligory is analegous as cars are constructed objects not intangible design like software. This a is shift change in ownership of an object to licence of IP use rights in my mind. Software is not constructed in the traditional way it therefore it cannot be treated in the same manner.

BTW You a re in breach of you licensing agreement in the EU and probably the US if you sell you games on as it specifically tells you there are no transfer, hire, or resale rights attributed to this software in part or full. WHY you ask? Because buying second hand software reduces the the revenue stream to the creators of those games. Royalties are only paid on the first purchase of said game and not on resale. Games are very expensive to create and market - way more than an "office" package and you pay about a tenth of the retail cost on average to own a game. So if you want a games industry stop pirating and stop selling on games as this does directly effect the developer - I work for one.