Iguanas are easily lulled into expecting humans to hand feed them. The owner thinks he is being a good handler (the good mother syndrome) for this, and the ig can't eat enough food per day if he is being hand fed. It also causes dehydration, because they lack the water that makes up a large percentage of their food's weight.
Dehydration is very sneaky and very bad.
But smart handling can get them back to self-feeding from a plate or bowel. It's tricky. Iguanas are very stubborn. The food pieces should be no larger than his head. Hard foods need to be grated.
I agree with Brian's ultimate solution. It's the only way. I want wholesale distributers to go out of business for lack of demand. I want iguanas to move one at a time from reputable breeders.
Yet we do not want to lose our right to get and raise iguanas. Pet store iguanas get a bad name and cause local bans. Ignorant owners also cause local trouble by allowing their igs to grow up as biting machines. One ragged cut to a five-year-old who is taken to the hospital for stitching up moves laws quickly.
To get a good baby iguana which is well cared-for is to use the I-net to find domestic breeders who have a good reputation. They do exist. To me, this seems ethical. These iguanas luckily lack the tropical diseases and parasites that are indelibly present in wild-caught or wild-hatched iguanas. So, they will save you many hundreds or even thousands of dollars of vet care in the first eight years. They are also more likely to survive into their twenties. That makes the cost of a good domestic small and rewarding in comparison.
I try to educate pet store and private owners about ig care. Mostly they don't listen. Then in six months I go back and berate them in front of customers. Maybe some of that has actually done some good.