Hi seat1aupper,
I saw your other post about this, and I have to admit it's the first time I've come across it, but had assumed you'd done this before.
The immeadiate problems I could envisage is at check-in. How do you check-in three times as the same person? Can the system actually cope with that?
Assuming you can get past that hurdle, will they be able to record your mileage x 3 - again, will the system cope?
Again, a check-in issue. If the flight is overbooked, what are your chance of getting three seats together?
Then, on the flight, if it is absolutely jam packed apart from your row, I can see someone stuck in a middle-4 row eying one of your spare seats and attempting to move. How on earth do you stop it happening?
Not sure about the compensation. If you are offloaded, then the general deal is either 50K miles or a round-trip free anywhere on the Virgin network. However, I'd want to pick over Virgin's T&C's of travel to see whether the second 2 seats are classed as no-shows; or whether there's anything in there specifically about multiple confirmed seats on the same flight for the same person.
I'd love to know how this all turns out. One of those things I'd thought about in the past, but never seriously considered

Pix