The real question is on the people who give money to get their name or the name of a departed relative on a siddur. Don’t they realize they are just giving money to the pockets of the owners? Not that there is anything wrong with that. It is much better than blowing money on a fancy car or wedding.
They also have the benefit of memorializing their names and their departed relatives’ names in a place where many other people will see them in conjunction with performing the mitzvos of prayer and Torah study.