Well, the whole purpose of gutloading is to pass on the nutrients contained in the gutload to your cham by ensuring that those nutrients are still loaded in the gut of the insect when you feed it to your cham - hence the term 'gutloading'.
If the insect digests the gutload, it will metabolise what it can use from the gutload, and the rest will be excreted in the form of feces.
That's the reason the insects should be given their gutload to feed on shortly before you feed them to your cham. They will consume the gutload, but not have a chance to process and excrete it, so that when your cham eats the insect, all those nutrients still contained in the insects stomach will be passed on to your cham when he/she digests it.
So if what Marc means is that he removes the crickets from the commercial gutload, and only feeds the insects veggies the night before, then none of the nutrients from the commercial gutload are being passed onto the cham, since they will have been excreted by the crickets by the time they are fed off to the cham.
This is another reason why you shouldn't leave feeders in the cage with your cham for long periods of time without access to gutload - because by the time they are eaten, they've excreted all the gutload, and if there was no food for them in the cham's cage, then they haven't consumed any more nutrients to pass on to your cham.
But I think what Marc means is that he merely feeds them a constant supply of commercial gutload, and then adds in fresh veggies the night before feeding them off to his cham. That's fine, because on average the crickets will probably have a mix of commercial gutload and fresh veggies loaded in their gut when the cham eats them.
(One of the reasons Marc is finding the crickets so attracted to the veggies is not necessarily the poor taste of the commercial gutload, but possibly because the fresh fruits and veggies have a lot of moisture content, and crickets usually drink up before they feed on the dry stuff).
The only downside to that is that you'll go through a lot of gutload like that (if you're constantly supplying it to your crickets), and gutload is not cheap.
I have two different dry feeds that I feed my crickets/roaches: the 'good stuff' (which is my home-made gutload - you could use commercial gutload), and the 'cheaper stuff'. The cheaper stuff is simply a combination of rolled oats, rice cereal and powdered milk. Along with left-over fresh veggies/fruits and a supply of water (I usually use oranges/carrots/squash to provide water), that's all the crickets need to survive and grow (although from time to time I try to increase the protein content a little by adding in egg yolks, crushed nuts/legumes).
The reason the 'good stuff' is more expensive is because it contains all the other essential nutrients I want to pass onto my cham contained in things like kelp, brewer's yeast, spirulina, bee pollen, etc.
Every night I put a few insects for feeding into a separate container that contains the 'good stuff' (and some moisture containing fruits/veggies), and they gorge themselves on that before I feed them to my cham.
(I do this with most of my feeders, including mealworms, superworms, crickets and roaches - they all get access to the 'good stuff' before being fed off).
So the gutload itself lasts a lot longer than it would if that was all I feed my insects, and I ensure that those expensive ingredients are being passed onto the cham, not simply excreted in the cricket cage.
Oh, and by the way, as for tasting gutload: I eat my home-made cricket gutload quite often (I like to sprinkle a spoonful onto my cereal). All the ingredients I use come from health shops, so it is all safe for human consumption, and since it is mostly baby cereal, powdered milk and nuts, it's even quite tasty - plus it's packed full of nutrients, vitamins, minerals...