"Why there are pokestops without spawns?"

#PokemonGO: The town where I live has only 3 pokestops. Since the last tracker update I've never seen any Pokemon signal in the tracker for one of them. Have you find pokestops like that? What do you think that's the reason for that? Do you know if there is something that can be done to have spawns near of that point? via /r/TheSilphRoad http://ift.tt/2s7HYSI