How many concurrent Time Machine backups can be run on one Time Capsule?

I'm using a WD My Book Live (MBL) GbE NAS for the Time Machine backup for 2 MacBook (Pro and Air) over wireless-N. It's very often the MBL gives "verification error" to one or even two Macbooks if both of them are doing Time Machine (TM) backup at the same time. I want to see if the Time Capsule will be more reliable.
The Time Capsule 4th Generation is using a Western Digital WD20EARS 2TB Caviar Green SATA HDD ($79) which is slow in spindle speed (5400-rpm) and slow data transfer rate (Serial ATA-300), while the previous TC versions were using 7200-rpm HDD.
Apple said Number of Users can be supported by the TC 4th Gen is 50. Does it meant that 50 concurrent Time Machine backup processes can be supported:
1. over the four GigaBit Ethernet ports?
2. over 802.11n simultaneous dual-band WiFi?
How come I start getting "verification error" after I started adding 2 more backups to a TC used to backup just one MBP?

The Time Capsule 4th Generation is using a Western Digital WD20EARS 2TB Caviar Green SATA HDD ($79) which is slow in spindle speed (5400-rpm) and slow data transfer rate (Serial ATA-300), while the previous TC versions were using 7200-rpm HDD.
That was the original release .. I am not sure now the ones you buy will be the same. Anyway the Gen1 Gen2 (identical boards) were 50% slower than the new TC Gen3 Gen4 (identical boards) They are processor bound.. you can put an SSD in the TC and the actual transfer speed will not improve.. so forget the disk.. it is faster than wireless by a long way.. a bit lacking for gigabit but file transfer for TM is not actually hugely fast as the TM process the files.
Apple said Number of Users can be supported by the TC 4th Gen is 50. Does it meant that 50 concurrent Time Machine backup processes can be supported:
1. over the four GigaBit Ethernet ports?
2. over 802.11n simultaneous dual-band WiFi?
How come I start getting "verification error" after I started adding 2 more backups to a TC used to backup just one MBP?
Concurrent users is internet.. and that is stretching things. There is no way 50 users can run TM at once.. the disk isn't big enough anyway.
TC is designed for domestic setup.. 3 or 4 Macs.. would be fine.
Your last point, I don't follow .. you stated it was a WD MBL not a TC.. and TM is really not known to work well on anything but a TC. WD disks connected to a non-apple router?? is hardly going to get apple support.. even an airport extreme with USB is not supported. TM is not reliable on airdisks.. so it doesn't surprise me if the MBL corrupts on a daily basis.
Same can happen with any airdisk.
http://pondini.org/TM/Airport.html
But I have to say I don't think wireless has been great for TM reliability in later OS.. especially if you upgrade installed.. TM is pretty easy to corrupt itself. So you get lots of issues reported here with TM needing to wipe the old backups and start over.
The older OS .. BTW I use 10.6.8 still is very reliable to a non-apple NAS. Everything went to pot with Lion and the new security level of AFP.

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