A stone dissolved in water mat be less effective than sugar dissolved in water.
2)It is plain - even to homeopaths - that it is absurd to maintain that fewer molecules have more effect than more of them. For this reason, a variety of notions, such as the solvent - or the container - having a "memory" of the substance have been grasped at.
Fasting do have different effect. It is like stimulating neurological system by presenting real or false defficiencies.
3) There is no evidence for any of these, nor is any plausible mechanism put forward as to what such a "memory" might consist of, or how it might create a medicinal effect.
Science is yet to know it. It can be miss or weakness of science because mass presence, live evidances and approved system by many controlling and government agencies do not discard it in dustbin.
4) We do know, however, that there are a lot of gullible, desperate or foolish people in the world, who would, for various reasons of their own, jump at the chance homeopathy might work.
And that is how this practice of charlatans and fools continues to survive, even today.
Nothing in mass presence all over the world and supported by controlling and government agencies can justify above.