Using "nested" Mount Points within Mount Points to add additional LUNs to a server

I realize that this might or might not be common and I haven't read or seen anything about this. So here goes...

No clustering. Just a strightup adding LUNs to a server mount point.

I have no issues adding a lun to a mount point (folder on the C-Drive) called MountPoint1. I can build a folder within MountPoint1 and add another LUN to a mountpoint within the first called NestedMountPoint1. I can build another folder within NestedMountPoint1 and add another LUN to a mountpoint within the second called NestedMountPoint2.

c:\MountPoiint1 (500GB)

   |-NestedMountPoint1 (300GB)

      |-NestedMountPoint2 (300GB)

First, do people do this? (Is it a normal practice?) (Recommended?)

Second, If it is a normal practice, Is there a limit on how many you can nest?

I can see doing this to add storage to a drive. BUT...