> the argument is they get you out of the copyright infringement caused by copying the software from disk to memory
This is not copyright infringement in the USA:
> …it is not an infringement for the owner of a copy of a computer program to make or authorize the making of another copy or adaptation of that computer program provided… that such a new copy or adaptation is created as an essential step in the utilization of the computer program in conjunction with a machine and that it is used in no other manner