In my mind - at these bigger programs, its just the cost of doing business. What is the worse that will happen? They will take back some wins, maybe a fine, take away some scholarships, etc - but in the end, the program continues.
Do you really think the NCAA will come down hard on UNC and ban post-season play for them? I highly doubt it. UNC and Texas are bigger than the NCAA.
I am not saying I condone these actions, but when you mandate these kids attend school in the first place (another topic altogether on kids entering the draft out of high school for hoops), then coaches - who have jobs and multimillion dollar paychecks at stake, and Universities - who understand the impact a great athletic program can have on the school both financially and from a marketing aspect - the reward greatly outweighs the risk.