As noted by marengo simple isn't always bad but your site doesn't look professional. I suspect most of your customers know you personally because I know I wouldn't purchase Hosting services from someone who didn't take the time to project a cohesive image. It seems your site could use a "make-over" and if you don't have letterhead/business cards, marketing materials etc then you should consider getting the whole enchilada. Your site should reflect the quality of your services, it is like most things, first impressions make a difference and your site's first impression says I'm stuck in 80's web design.
Honestly, it doesn't look bad, it just looks lazy in the modern market. To your customers, who could compare you to a number of competitors, they could get the idea that little work or attention has been paid into drawing a clean, professional image for your company.