That is very true - about them not putting in the effort of hunting if they know there's something easier coming along... I have that situation with my gecko, unfortunately... Someone else was taking care of [my now] gecko for the first 3 1/2 years of his life, and was convinced he couldn't hunt, so he was fed crickets on tweezers for that entire time. Now, my gecko won't eat any other way. Occasionally he'll catch one (and if I'm out of town and my friend comes to feed him, she refuses to pick up the crickets) so he's left to get them on his own. Like I mentioned above, if they're hungry, they'll find a way to eat what's available. Good luck, and keep us posted!
Oh! Another suggestion. A few months ago, my gecko was constipated (never figured out why, and it was only once for about 9 days). Since then, I've been keeping track of each time he poops and if it looks normal or not. I feel it's a good way to make sure everything is 'on schedule' and makes it easier to notice how long a problem has been developing, if there is one.