Leadbolt does require it as part a verification process. It's a good idea to think about getting a website together, whether your making mobile web games or native installs for the app stores, you're going to need it to help promote your game(s). There are plenty of both, inexpensive or free hosting solutions, and/or WordPress for FREE to get started. Also I just gave you one example. Search the tutorials sections for "banner advertising" or "admob" and you will find other options. In addition there are literally dozens of in-app advertising solutions' available that you an google to find. Not all of them easy to implement, so you have to look around.