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My guess is that the organic soils are holding water longer, which is matching your watering schedule. Your pre-bonsais are living like houseplants and getting by. The only thing that I would be concerned about is seeing what your new growth is looking like. When you say that one ficus sitting on the table is growing - all I can picture in my head is long, leggy branches with very large leaves.
If you want to move to the next stage of bonsai development, potting them and styling them, then you'll have to pay more attention to watering and fertilizing. Its the extra steps that help you achieve ramification and small leaves, which is what makes bonsai look like real trees in miniature.
If what you are doing is keeping your prebonsai alive, then keep doing it. But I'd be curious to see what they looked like, their leaf size and color, and their branch lengths. I think you might be doing yourself a dis-favor in those categories.
-Centaura
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