The kids who only got in with some SAT fudging, like Felicity Huffman's daughter, were probably just below requirements to get into some of these universities. I read somewhere else that USC has so many applicants that if you don't have a 3.8 GPA with a 1400 SAT you are going to be the odd man out. So if you need 400 SAT points to get there, you probably aren't going to do it with just good prep (which usually only nets you a ROI of 200 or so points). So it's not like these people are complete morons and $15k is a pittance for the parents.

Lori Laughlin's daughter was probably a pretty poor student. Apparently she paid upwards of $500k to get in via the student athlete route, even though she's not an athlete. She's apparently a fairly well known Youtube/Instagram blogger who has made posts about not even wanting to be in college.