Why would they buy it no one really pays for music these days
Because away from the online world where digital theft is as beyond rampant, you still receive monies for ad placements (commercials anywhere they're run, even on YouTube right before the song you're stealing), background music for any number of shows or platforms, movie placements, and more. In the professional end of the business, you still can make money when songs are used in these avenues. Imagine if you placed songs or entire soundtracks of hit movies that play over and over for years like
TOP GUN, THE BODYGUARD, or
GOODFELLAS. There's one-hit-wonders from the 80's that still get checks from
MIAMI VICE re-runs. Also, look at the various artists that now have Broadway plays featuring their music. Ka-Ching $ $ $ .
The sale prices of the catalogs of artists we've seen lately would not take place if the buyers were not completely convinced in the long term viability of using these purchases as assets in the long run. And as pointed out previously, it's one hell of a payday for artists that are Social Security age and older.
The digital piracy that collapsed the traditional record and promotion business is why grandfathers and great-grandfathers are still on the road, as the traditional lines of income have vanished.
'Why would they buy it no one really pays for music these days' is EXACTLY why these changes have come about.