The hypocrisy of both clubs is astounding. Back in late 90s-early00s when you had clubs like Deportivo and Valencia who were both still competitive in La Liga and Europe, the big 2 negotiated the new La Liga TV deal which would make them earn over 100m €(50% of the pie) each season while the rest of the clubs would get scraps. Meaning from 2001/02 till 2015-16 each of the clubs pocketed in over 1.5billion€
Karma is a bitch
I'm going to answer because I've been cited. I'm not surprised you know nothing about this theme and that you prefer to blindly blame Barça/Real.
In the 90's (even in the first years of the XXI century), TV and merchandising money wasn't as important as it is right now, it explains by itself some differences... and...
- 1995: Bosman Law. Until that year, teams were able to easily keep their main players because of this limitations. This is the main reasons why you don't see anymore surprises from countries like Romania.
- 1996-97: Digital TV expansion. Sport rights were the main objective of them. The "1st World of (spanish) football" took place. These companies started to bid up for LaLiga rights. Teams like Valencia, Deportivo, Sevilla, etc. were the main interested in individual negotiations because they though they could get more money... and they did. TV rights increased 500% in that season, you hear that right, 500% increase. Teams overspended and "La Liga de las estrellas" ("the league of the stars" was born). For a few years Deportivo, Valencia, etc. were able to spend a lot of money and they had good results in Spain and Europe.
- Early 2000's: these companies were losing money and the new TV rights deal was worse... but every team kept negotiating by themselves because it is what medium teams wanted a few years ago. Barça and Real still had interest, fans and money and they thrived. Deportivo almost went bankrupt, like Valencia and many others. In the late 90's and early 2000's tons of teams disappeared/were relegated because of their financials were unsustainable without the TV money.
- 2015: rights were finally sold in a package.
So yeah... karma is a bitch that brought Deportivo to the Third Division because they wanted to negotiate their rights alone.