Who knows for sure but the fact all these tours are available on YouTube will imply the rights aren't in the hands of someone who has a vested interest to make money.
They are a great nostalgia trip and you get alot of great recordings from the unofficial sources. (Virgin Dallas, RIT Lisbon etc).
To grab hold of any of them, remaster them and edit them would likely not be commercially viable anyway...and lets face it Dear Ms voice has improved post Evita.
In summary, hold onto the nostalgia and nab a bootleg version. It's a win win for fans.