A toilet is just a toilet, right? That's the kind of thinking that makes a lot of clients ask why one in the basement should be any different than one on the first or second floor. They don't understand what's involved in making waste flow up, against the force of gravity.
Next time a customer asks about putting a half bath in the basement and then questions you about why it's so expensive, send them a link to this short video. It'll help them understand the whole process.
To get the waste out from below the sewer line, you need a macerator installed behind the toilet to chew up the waste and pump it up to the house's drain. To make that work, you also need an electrical outlet close by to power the macerator. This is more than just straight plumbing.
The unit we used is made by Saniflo