It depends on the company. Look into to detail. How long have they been around? Do they have a lot of customers? Do they have long term customers? Here at Mark Digital Media we have been up and running since 2010 and have got many happy long term customers!
It depends on the plan you choose. At Mark Digital Media we offer reasonable but cost effective prices to our clients. So if you are a small business looking to start up with SEO, SMM, PPC or Website design we will be able to help you out.