There are a couple of benefits I see of a VJ over a standard Joey (with both being $7). Although some may not matter to many people it may to some.
- With a VJ you can deactivate it when you want without having to purchase the Joey. As opposed to paying $100 (or whatever the current price is) for that privilege. This only matters if you don't plan on using all the joeys every month.
- No hardware/cables to hide beyond what you already have. I know it isn't too hard to hide a joey behind a wall mounted TV, but this would avoid that altogether. Some people don't care about this, but others are completely anal about it.
- You can move the VJ to any TV that can run it (or the PS3/4 when that is released) without having to have coax run to that location.
That's all I can think of off the top of my head, and they may not matter to many people, but I can see some people really liking those aspects.
And really, if you don't think it's worth $7 then don't use a VJ. Just stick with the other options (at this time just the original Joey).