I would say that not everybody is into breeding. Or maybe they have future plans that can wait a few years.
I prefer babies as well. Why? The same reason I prefer kittens and puppies: I can see them grow over the years. And I feel some kind of pride seeing that I raised them properly. Also, I tend to have better and stronger 'bonds' with the pets that I've had since babies.
Another plus of babies is the fact that most morphs have better coloration and looks as babies. Not to mention the price!
However, most of the times, the price of the adults is way less than it would cost you to buy the baby and get it to that size (food/water/substrate/electricity).
Although I prefer babies, if it's an excellent offer, I would take an adult without thinking it twice
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