I cant speak for everyone because like people I suppose all Leos are different...
BUT
In my experience they just eat what moves... I can feed mine supers, crickets and then put mealies in a dish at the same feeding and they will go eat them too.. lol
Sometimes it can take a few minutes for one of my geckos to find it and by that time the other has it nearly cleaned out though, so I guess it would be different if you had a lot housed together and your feeding preferences. Until we had the second Strykes food "fell from the sky" so she would get excited when we removed her lid.. hehe Didnt matter what we threw in, she ate it if it moved. We did the same with Cricket, and now that they are together we just supervise the feedings to make sure nobody is hogging the food. So the long way to answer your question for me, it would be a waste of money.
You can put em together if you want, you want to be sure you have two females though, you aren't ready for eggs yet. (imo) Also be sure you have lots of seperate hides so they can get away from each other. But really, they don't care if they are housed alone. Its up to you.
I'm sure others have different opinions, but thats my two cents =-)
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Mommy of Many
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