How much would be the hosting cost per month to host an event ticket selling site (like eventbrite.com)?

[Jake]

Yea just data caching on AWS is pretty cheap but their complete site hosting is obscenely expensive, assume both for traffic and security reasons you would probably need a dedicated server. Whether is is managed for you, the speed of the PC and connection effect the cost of probably $75 to $300 a month.

Here are the options on the popular hostgator
http://www.hostgator.com/dedicated

That is really a fairly low traffic figure and realistically may be handled by a good quality shared server, something better than the run of the mill $8 a month deals. A middle ground may be a Virtual Private Server where you are allocated a portion of a server's resources, you are generally expected to hae a higher level of expertise to manage these private servers.