10Gb switches will commonly be seen used as a ToR switch. Being heavily used with storage and virtualization environments. The actual need for one will greatly depend on your environments network needs. There are several different brands of network analyzers, but these analyzers can help determine the amount of traffic on the network. Use this information with projected growth, and you will have a good idea of what switch speed best suites your network. 
I'm a Korean engineer, beginner... Actually, my company would like to sell 10G switch. So, we bought Dell 8024F switch. To sell it, I do think that I should handle it. But suddenly I wondered when people use 10G switch...?  Just to use more traffic?  Besides of this issue, maybe It is likely to have another viewpoint..  Consider me as student(Actually I'm student too and worker), Please teach me why does it use? Thanks for reading.
Can I ask you guys about 10G switch?