My problem with 'live' performances is the prohibitive cost.
For example, the ticket that my daughter bought for me to see/hear ARW next March cost £72: personally, I would never contemplate spending that much money on a live performance (nowhere near it).
My wife loves IL Divo, but every time they visit the area she can't justify spending north of £160 for both of us to see/hear them (and she's not prepared to go alone).
Then, there are those performers who never visit these shores - such as The Rippingtons, for example. Also, some international artists only perform in London: so there's additional travel and accommodations costs to consider.
I would rather spend the money on CD/DVD's to see/hear such performances in my own home.