I can't help you with the breeding of tegus since I have no experience there.
As for incubators...I've hatched beardies naturally and with an incubator. I think the reason people use incubators is because there is a financial investment involved and the breeder has a vested interest in watching the eggs. If I have a clutch of lizards or snakes worth thousands of dollars, I'd feel more comfortable incubating where I can see them and make minute changes as needed in a microenvironment. If the eggs are buried in a nest, who knows if they are getting moldy or dehydrated? Plus in nature, the likelihood of offspring growing to adulthood is reduced, hence the large number of eggs to replace a pair of adults. It could be because of egg issues or predation on the young.
Most tegu breeders are not in South America and it is difficult to reproduce that environment in captivity. I think most of us reptile keepers get it right most of the time and the animals we keep and breed are those that can tolerate the differences. It's very difficult to get it just right 100% of the time and eggs are much less forgiving than adult animals.
I'm sure there are people who use incubators and people who use natural methods. It just depends on what you are comfortable with.
Laura R (FL)
1.0.0 Colombian Tegu
1.4.0 Argentine B&W Tegu
1.2.0 Red Tegu
1.2.0 B/WxRed Tegu
1.0.0 Green Ameiva (yet another teiid)
7 other lizards
1 little gator
3 FL box turtle
1 Sulcata tortoise
16 snakes
5 fuzzy pets
4 little frogs
a bunch of creepy bugs
and a partridge in a pear tree
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