I get your point but the unrealistic aspects your talking about would be fine for me in BL stories. Suddenly falling in love. Meeting and dating a billionaire, all of that is unrealistic fantasy yes, but that's not what the problem is.
In a lot of gay fiction it's always the same, either the gay characters are loud, over, sexual, deviants, or they are neutered, soft, saints who don't seem to have any real sex drive or treat a kiss like it's full blown sex.
Then there's the constant top and bottom stuff where every gay relationship has to have a clear cut guy in the relationship and a girl in the relationship.
I straight fantasy sure the girl might find herself dating an unrealistic perfect hot guy, but at least the girl can have a personality. At least she can be two or three dimensional.