Many web sites crash when there are more visitors than normal. A traffic spike is a valuable opportunity which you should not waste because the service provider couldn't keep up.
Do you know how many real visitors your site can handle at best? We use Supervisor.com to ensure that your site performs as promised. Maybe you should verify that your current provider delivers what you are paying for?
Traditional web hosting providers offer fixed capacity at a fixed price. The downside is that your either accept your web site not being able to serve its visitors on busy days, or you unnecessarily pay for dedicated capacity also when you don't need it.
Purasu.io enables the best of both worlds with a fixed price based on the number of concurrent visitors you want to be able to serve.