Being a hobo isn't a profession it's a way of life. Where you live has absolutely nothing to do with a profession. I'm not a "professional renter", I just rent a house to live in. You can't be professionally homeless either. So no, neither of those things deserves professional respect.
I think whether or not people deserve respect, they deserve to be treated with respect, whatever the profession they're in. You have absolutely no idea what someone has had to go through in their life to get them to where they are. Some people climb mountains, while for some people climbing a flight of stairs can be a challenge, it's all to do with who you are.
Being someone with a whole family full of Doctors, Teachers, Headmasters, and where everyone in the family has at least one degree, you know, people that might get a gold star from the community saying "Respectable", I am also friends with many people who do completely different jobs that require no education I can tell you that neither groups deserves more or less respect than the other. Being a Doctor comes with its perks. Even training to be a Doctor comes with its perks. It's something that some people have the natural intelligence and opportunity to pursue, so awesome for them, but I don't think it's fair to give someone who is skilled in another area less respect because people have decided it's harder to become a Doctor. I know people who are Doctors who couldn't for the life of them do other things, it's all about the person and playing to your own strengths, interests, personal experiences and opportunities.
Being a camgirl in many ways may seem like a piss easy job, and yes, technically anyone can stick a camera on and be a camgirl, but it's what you go through in life that makes you confident enough to stick on that camera. The experiences you have that makes you socially intelligent enough to become a successful camgirl and not quit after the first few months. I may not have done any degrees or have a piece of paper saying that I am educated in this area, but I have used all of my education and life experiences to get through being a camgirl. I am someone who matured at the peak of the recession, wages are low, jobs few and far between and a degree has become almost meaningless, on top of that living costs are higher than ever. So yes, rather than complaining and putting myself into debt, I found a job where I can use everything I have at my disposal, a job that allows me to pursue other dreams and live my life. I think in it's own way it does deserve respect.
Sex work is a funny thing. If I did ANY other profession, managed to find a job at this age that pays this well with no education in the area, managed to support myself happily and still have enough time and energy to do other things, I know full well plenty of people would respect me, yet for some reason "sex work" doesn't deserve it...