When choosing a WordPress hosting company, price is not all you need to consider. You also need to think about what features you need for the project you plan to work on, the amount of space and bandwidth they provide, and whether or not they can assure against downtime. E-mail support and ask a simple question and see how long it takes them to answer you. That's always a good indication of the service you'll get later on. If they're not fast and friendly to a potential customer they'll probably be even worse to someone who's been with them for a while.
Choosing a WordPress hosting for your site can improve your SEO, response time and therefore increase sales.
It's always a good idea to check around and don't just jump on the first hosting provider that tells you they're going to give you a good deal. If possible talk to a few people who use the services and find out how long they've been using them and if they're satisfied. If they offer an outlandish amount of space or unlimited e-mails or anything that sounds too good to be true, be careful. Some hosts will offer a lot but only deliver a little because they figure if you see that they offer so much for the price you'll pay a high price for it whether you need the space or not.