Because like you said, you are more likely to lose away games then home games. Also like you said on the news page:
These games earn more revenue than other matches and have a higher impact on your fan base than normal games. Win big or lose a nail-biter on the road on TV and everybody wants your star player's jersey. Lose big and be prepared to look at even more empty seats.
So teams playing 2 away games may lose a lot of revenue not just from that game but others as well. Why not make it 4 TV games split 2-2?