Does anyone understand pricing behind waste removal?

[Nate Hall]

As the controller for a property management company, I have to sign off on all of the bills. Most utility bills are pretty straight forward whether they're high or not, but the waste removal bills are a different animal. I usually check on the costs of an 8-yard dumpster and divide it by the number of dumpsters and the times it is picked up in a month so I can get the cost  of one pick up for that dumpster. So far, I've seen fluctuations between $30 to $300 per pick up of an 8-yard dumpster. Can anyone explain why there is such a variation in pricing?