I was just thinking of making a small network which would only be for personal use, no selling of links, no nothing. I also thought of making such networks for each individual client site, but I don't think this would be worth it. For example, if I had a client in the "dog training" niche, I would make a network of sites about dogs and dog training, I would then use these to boost the client's main site. But I don't think this would be worth the money because in order to not make it look fake I'd probably only be able to link once and for one keyword only. Let's say I have 10 sites in this network, for one keyword it may work and may bring some good rankings but not sure if this would be worth the money and the work involved, for a personal project it probably would but when it comes to clients, I'm not sure. Anyone with any experience?