Accepting the reality that the producers want to make money does not mean you have to like it.
Also if their goal was to increase ratings and make more money, they didn't do such a great job with that. Adding Seven was clearly a good business decision, as it briefly increased their ratings. But Voyager's constant focus on short term ratings grabbing over quality writing and long term fan loyalty was clearly a poor business decision.
Lien, well, her gimmick was the least 'Sexy' out of all the characters gimmicks, so it was probably the short term 'Safe' decision, the statistical best bet.
And with Fury, I'm pretty sure Berman actually thought the fans would enjoy that. Just like how he said with Enterprise's borg episode how fans would be pleased with the 'Continuity'.
Voyager is one of those shows that proves when you choose ratings over fan loyalty you end up with neither.