Third, they have more experience with collecting, and fourth, they are serious enough about minerals to have invested heavily in expensive equipment. In short, the micromounters have often been through the rest of the hobby, and have finally settled on micromounting as the final solution. Remember, above all, that a good mineral collection is a collection of representative crystals. Massive material, with the minor exception of the very rare, is acceptable only for cheap and dirty. It's the paperback of mineral collecting.
Crystals are the hardbounds and first editions.
The first response, therefore, is that many minerals come in small crystals only. It is impossible to make a significant systematic mineral collection without including some very small crystals. Very small crystals need a microscope for proper examination. They are also less likely to be affected by mechanical forces or changes in the environment over their period of growth. This classic cluster of eudialyte crystals from Mont Saint-Hilaire illustrates well the beauties of colour and habit that have made that locality one of the wonders of the mineral world.