Why is it important to have lots of followers?
Online presence, more specifically on social networks, relies upon numbers, that is, the higher the number of followers the better will be your scope of success. When people notice that a particular brand/individual/firm is gaining popularity on Twitter and enticing followers in huge numbers (even if they are fake), they are likely to get attracted. This will boost your number of organic followers. Meaning you will get real and active Twitter followers. We humans are social animals, we need to interact and we do get influenced by others.
Another benefit of increasing followers on Twitter is that you instantly appear to new users as an important, reliable and dependable business/franchise/brand/service-provider. Credibility can easily be proven on Twitter or on any other social network (e.g an Instagram account) by increasing the number of followers.