Horn worms shouldn't be a complete staple insect though they are very healthy...and for baby dragons crickets are the most easiest and cheapest insect to give...
Also, do keep in mind that the 36 crickets = 5 hornworms..is probably comparing 36 adult crickets to 5 adult hornworms. Hornworms grow fast, faster than silkworms, reaching full size in a couple weeks with a steady source of food (only the special chow you buy with the worms...can't use their natural food sources (tomato plants) as it makes them deadly toxic to just about anything they are fed to. They will eat other greens but just die in a day or two...
Baby bearded dragons will need very small horn worms..considering a baby dragon is usually 6-8" when sold, a full grown hornworm is 4-5" long..can't feed that to a baby dragon. So you have to feed the smaller horn worms...
They are also quite a bit more expensive, compared to other feeder insects, and you will have to buy small amounts to ensure your horn worms don't end up too big before you can feed them off.. so if you feed 3-10 small hornworms (under a inch long) 2-3 times a day with baby dragons... Hornworms come in cups that hold about 20 hornworms plus enough food to grow them to full size...and sold individually, at maybe around $50 / 100 but too lazy to go research different suppliers online...so will say with shipping etc, they are $40 per 100 small hornworms, with food. One dragon will probably end up eating say 20 small hornworms a day (between three meals) so you are looking at 140 a week. Thus, you are paying $50 a week on hornworms..to find a single dragon. That is assuming of course the dragon doesn't end up eating more than you expect and the worms don't get too big to feed.
Better to feed crickets to young dragons, then start switching to other insects once your dragon is around 4-6 months old and over 14" long. Then you can feed silkworms, hornworms, superworms, roaches and larger crickets, as variety, as well as greens etc.
Or get a hold back animal which typically are nearly full grown from a breeder, and you don't have to worry about feeding much insects at all, just the salad and a few superworms, hornworms, silkworms, butterworms offered couple times a week.
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PHLdyPayne