This means that generally students see the 1st job as something transitional. It also means that a big chunk of the CVs I get are from people that didn't/couldn't make it into BigCorp, ie. people I also don't need.
Changing jobs is also a traditional way of getting a raise and I wouldn't want to get into the counter-offer game too early.
But this time I think the problem is the CVs I've been receiving aren't that great, so I am reluctant to invest in training because I'm reluctant to pick any candidate.
The definition of "training" varies quite widely, and also the actual enforcement of the clause can vary between companies. It happened once in one of my classes, the company had the trainees sign this particular clause and it made for a very interesting monday morning.