I don't begrudge any of the ex housemates success in media jobs if they can manage it. But the difference between Ben and Mario is that Ben was already doing media work before BB, and hopefully achieved a boost in that now

Although he himself stressed concerns that BB might hinder rather than help in that area. So I can understand why Ben is more sought after than a few of the ex BB 11 housemates as he has the charm and ability for media work, especially radio, he has the charm and voice and the abilities needed for a radio show and he loves his music
Mario on the other hand was jobless before BB wasn't he? Has no real media skills to build on, but seems to expect everything to fall in his lap anyway.
As much as I dislike Mario's personality, good on him if he can achieve his dreams or some of them, and if he lightened up on his asttitude, acknowledged his own faults and took faults in others for what they are, he is likely to endear himself to others more, especially in the media world, which should go a fair way to helping any career opportunities that come his way. Because at the moment he doesn't seem to be doing much apart from tweeting and posting some nastiness at others and not expecting retorts and even encouraging moleholers to follow his suit.