IP address is not a good indicator of anything. We don't use it for any internal use (it's not useful for anything).
The most likely case is that there are multiple customers behind the same IP address. (Very likely) This is a common occurrence in corporations and other organizations (e.g. schools).
Shoot me an email at wyatt@wyday.com with some trial IDs of the verified trials you think are abuse and we'll look into them. (You can get the trial ids from clicking the "view details" link and copying that URL)
We need to make it clearer on the verified trials list so it's easier see exactly what is going on.