I susoect the particular thing about little boys particularly and dinosaurs is twofold - firstly they are scary monsters which is always appalling, and secondly they have really exciting-sounding names that grownups can't seem to learn, so it gives a sense of power! I do have to take issue with OP's assertion that 'Unless you become a palaeontologist, there's precious little you can learn about them that is relevant today'....I am a geologist so that is the worst heresy to me!! What these skeletons tell us is more about how species evolve, how niches are exploited, what it is to be warm- or cold-blooded.....also the sediments in which we find them plus the state of preservation and the spatial dispersion of the bones gives information about the environment, possible cause of death and post-mortem predation. It horrifies me to hear someone say that fossils have no relevance to non-academics. Even if for most people they have little appeal, they spark the imagination of children.....surely this is of supreme relevance. ....or would you prefer your grandchildren to be dullards incapable of independent thought?