Do you want this to be a day job? If you can do the research yourself (because no one will share on public forums) some people have turned travel hacking into a full time job, which works great if you want to travel the world. But if I already have a day job, this is just gravy and something I can do as a hobby. Low hanging fruit on this forum, which is all that I do, is sufficient to get the annual vacation paid for at a fraction of the cost.