This is exactly correct. Many moons ago I had a crappy job running a mail room and copy center. When all of the copiers, printers, etc started going network, my company paid for me to take a computer networking program at a local college under the agreement that I would either work for them for at least 3 more years or be responsible for paying them back for the tuition.
After I completed the course and started getting certifications I got a really good job offer and I took it. I 'broke' my contract, paid the penalty (paying back the tuition my employer had paid for) and never looked back.
The penalty for my leaving was specified, which is what allowed me to leave. They could just as easily have not given me that out so obviously there is a reason they did it. Probably because it's not worth it for them to sue later.