Yes, there is a reason and it has to do with licensing and royalties. The
companies concerned are too cheap to pay MS for an NTFS license. They rather opt for the cheaper FAT32 license. This has to do with the software which pre-loads the Operating Sytem or restores the OS (not the OS itself). So while Windows XP, Vista and 7 are capable of formatting to NTFS, the software that pre-loads the OS is not. It is quite likely a variant of Linux. And the companies have only elected to pay the cheaper license to MS to pre-format the discs.
Fortunately you can easily shift and convert the underlying file system to NTFS. Very good Instructions here...
http://www.aumha.org/win5/a/ntfscvt.php