Usage restrictions aren't necessarily a bad thing – they almost always make sense on some level. They're designed to help maintain order and support the value of each property in the subdivision. On the same coin… if you aren't aware of these restrictions before you purchase, they can also create some conflict with the plans you had in mind for the property. This isn't common for most land investors (because most people have no intention of using their property for purposes that don't jive with their surroundings), but even so – you should always make sure you understand what the rules are BEFORE you buy a parcel of vacant land. This will help you avoid owning a property that requires maintenance you don't want to do, or that can't be used for your intended purpose.
Market for Land is Less Active – The market for existing homes is almost always more vibrant than the land market. There simply are fewer numbers of buyers for vacant land than consumers looking for homes. Start marketing a new home listing and a new lot listing when both are desirable and priced well, and you generally can expect fewer contacts about the new lot listing.