As a SEO company you are always trying to get more links, especially to international customers. One way to do this is to use multiple European C-classes, which can help foreign websites rank higher in search engine results pages.
Links are what will get your sites ranked, and links that come from websites in the same country as your clients’ websites is the best way to get good results. If you develop C-classes in other countries and hire content writers to fill them out with pertinent information, you can offer these services to your clients who have foreign websites.
With SEO hosting you will own and control these sites and their content, which gives you more say over what goes on, and costs less than buying links.
Pick up multiple IPs from a variety of companies, and use SEO hosting to your advantage. It will cost the same as buying IPs in your own country, but give you far more flexibility and options for clients.