1. SEO is a most powerful, in fact the only way to get you self rank high SER.
SEO Performance SEO It not only ranks you high but it also keeps you a step ahead from your competitors.
3. It has high ROI, which makes it cheaper even if the prices are high, it is just like you pay $1 and you get back $ 4.
4. It increases presence along with your rank, it is said that higher the presence higher the traffic.