of course, what's really to stop a scalper from buying 4 Red Zone tickets... keeping 1 for himself. Then selling the remaining 3 for a lot of money, as long as they all enter the venue together at the same time.... So in that sense, the Red Zones theoretically ARE transferable. But that's probably the only way.
A scalper could sell all four of them at the venue. Red Zone tickets are not electronic. They are traditional hard tickets. And even if they are electronic the scalper doesn't have to enter the venue. They just have to walk people to the ticket checker who swipes the card and lets the correct number of people enter the venue. The owner of the tickets does not have to be one of the people who enters. I have seen people do this a lot.
Stubhub has permanent "last minute service" locations in a couple of major US cities including LA. That's why there have been a fair number of RZ tickets sold on Stubhub for the Rose Bowl shows. The scalper can pick up the tickets at will call on the day of and run them over to the LMS location. Then the buyer can pick them up at the same place. That is really the only way to sell will call tickets through a third party. It's not possible to do this at most venues unless Stubhub sets up a temporary LMS location, but they typically only do that for major events like the Super Bowl.
If there is no Stubhub last minute service location there are a couple of problems to consider.
1) The scalper would have to show up at the venue, get the tickets from will call, and hang out on site until they sell them or eat them. Meaning, they would have to live nearby and take the time out of their day to deal with it. Most scalpers these days are lazy and only interested in easy money. They are not willing to do that kind of work.
2) Trying to dump high dollar tickets at the venue is not an easy proposition. From my experiences, most people who are hanging at the venue looking for a ticket are looking for a deal and don't even want to pay face. Finding someone with $350 in their pocket (face value) won't be easy let alone finding someone who is carrying a lot more cash than that AND is willing to pay way over face. It's a risky proposition, especially with $1400 on the line (350 x 4).