The difference being that Pilot B is selfishly depriving someone of a salary by paying for his hours while working. In the long run he screws himself and the industry in that it becomes unnecessary to hire crews if you can get low time cojoes to fly for free, and even pay for their hours.
At the end of the day with 350 hours TT and 100 in C208, you're still a low time cojoe that is unemployable because the next low time cojoe is happy to pay the company to have your job. If you do get a job, the T&Cs will be severely reduced because they're doing you a favour by paying you when they can get someone else for free.
As for garnering any respect from your colleagues, try elsewhere. Any self respecting chief pilot with the crews' interests at heart will hesitate to employ someone who is willing to screw his colleagues to shortcut the system.
Cause and effect...