You clearly DON'T understand it though!
it's hardly "selling out" to make their music available via the most common/only technology around. If your average new band only released a CD who on earth would buy it? Most people don't even have cd players anymore!
Again, if you "used to pay £12 for an album" that was twenty plus years ago! Even if streaming had never been invented that would probably be £20-30 an album nowadays if prices had risen along with inflation. 2 or 3 albums a month = £750 a year plus a few £40 concerts which you would also have expected to increase with inflation, so actually more like £80 = just under £1000 per year. Or you can stream spotify for free and spend that money on 6-7 £150 gigs a year, and if you don't go to that many, you're actually quids in.
"exposure" doesn't pay the bills! Expecting performers to not make any sort of profit on their work is what's unfair.
Touring is hard work - away from home for months at a time, sleeping on the road, having to perform at 100% even if you're feeling sad, or ill or stressed. It's not like 99% of the ticket price goes to the artist - of that £££ they have to pay security, management, sound and lighting technicians, make up and costume staff, personal assistants, backing vocalists/dancers/musicians, transport and hotels for all of the above, people to check the tickets, cleaners, costumes, sets, lighting, outlay for merch, venue fees, advertising, % to the ticketing website, huge amounts of insurance...if they get 5% of your £100 ticket they're lucky, and if it's a band rather than an individual that's then split 5 ways.
Basically = tell me you don't have a clue about either music or finance without telling me....