Scaling link building is definitely something you need to look at since this is something that will help you to keep growing in ranking positioning. The problem is that most things associated with link building are not at all scalable.
What is really interesting and is scalable is broken link building and guest posting. Some will tell you that infographics also do well but that is not as common as it used to be. Guests posts will, most likely, never disappear and can be pretty scalable. Broken link building is something that is rarely recommended since it is difficult to do. However, it can work pretty well.
What Can You Focus On?
Scaling is something that everybody loves. It is connected to link building and adaptability is necessary. Instead of only staying focused on scalability, you may want to focus on processes and people. People are the driving force behind your SEO campaigns. You need to have talent working for you and you need to keep increasing your knowledge at all times.
The link building process involves everything that you do in order to get new links, including metrics used and tools that are bought for this purpose. Whenever you are faced with lower success rates with the link building campaigns you create, you need to test everything that you do.
Scalability For Small Businesses
Scale diminishing is really common for the small businesses. In most situations there is a mention about the lack of available time to do the necessary link building tasks. A small business needs to basically create great content, content that is useful. This is what will drive scalability on the long run and what brings in high conversion rates or sales.
Focus on creating a community instead of focusing on the links. Search traffic flow is maintained when people get to see your brand more and products/services are recommended. Remember that creating really good content is never enough. You need to get that content across so people of interest can see it.
Every single site owner wants something that is scalable. 100 links that come in are great but it is hard to scale everything. There is basically no tool or service that you can use only for scalability purposes. It is really important to focus on incorporating people into the link building process. Scale continuously but remain focused on real values and the people that want to buy your services or products.