Maybe, but if you treated them as more than a disposable cog, as is the trend, they might not. Show them opportunities for promotion, be respectful of their time, show them they won't be fired for petty reasons, and generally treat them like a human being and let them know they have a future with you. Searching for jobs sucks, being the new guy sucks, discovering that a new company's culture isn't a good fit and having to start the process all over again sucks. Give them enough reasons not to go through that and the money won't even matter that much if they have any wisdom in them at all.
Another advantage of training them yourself is that you shape them into precisely what you need. They know your systems, your work culture, your priorities, and are continuously adding to their institutional knowledge.