People need to pay some money to buy softwares, but sometimes the bought software copy can not be shared to others even if I do want to use it anymore. This could prevent people try and buy unknown new softwares.
But what if these software copy can be trade or sell to others later? People will not hesitate to try new softwares even if they need to buy it, because they can easily sell it in market which is also supported by game/software providers. This model will increase their sale record and help them to discover the optimal price, why not?
With the support from game providers, user experience will not be a problem for normal users.