I'd say a healthy LIE would always be something of an opportunist but can use those powers for good. Being an exploiter isn't inevitable since character is separate from cognitive functions. Since you're seeking real life tales, it got me thinking about two LIE males I know. One is married to his dual ESI, and one is married to an EII.
The dualized LIE is a great guy, probably 3w4. I think he's Sx first, and he treats his wife well. It's cute. I wouldn't describe him as exploitive at all (of her or in general), he's a team player and observant of others' needs. He works full time, is a landlord, and hands on with their daughter. One funny little story, though. They hosted a Japanese foreign exchange student last summer. I said, "Oh, that's cool of you." He was like "yeah, we've both wanted to visit Japan, so now we have a connection there in case we need a free place to stay." Haha.
The LIE married to an EII is also a type 3, but So/Sx. She financially supported him to go to grad school first even though she wanted to go back to school, too, had just had a young daughter, and they were paying off his student loans. It's one of her biggest resentments against him. He barely made it through after three awful, stressful years, and stalled and stalled taking (and failing) multiple expensive certification tests for several years after grad school. He's tried multiple part time jobs that are sort of related to what he said he wanted to do at the beginning, but can't seem to make it work for a variety of reasons and blames it on everyone else in his environment (coworkers, bosses don't understand him, it's not what he likes to be doing, etc. etc.). He has a better job now and she only works part time, but I think those 7 years wore her down and drained a lot of the love.
Is that exploitation? I don't know. He's definitely not interested in leaving her. She's acknowledged her role in the dysfunction and that it was a mistake to give up her dreams for someone else, but it's really hard for EIIs to apply pressure to anyone. She's so soft on him even when she thinks she's being tough.
I also think the second LIE struggles with narcissism, while the first one does not. Not more than any other person, at least.