Well, ya can't start this process with a ton of debt, but if you work at it, it can work well without the debt load - sometime down the road, in the future, or maybe in your next life...
Echoing Les here - do your homework, know your knives, buy and sell fairly with a little profit in mind....and you'll probably do just fine.
With regards to knife addiction, I guess I know as much about that as anyone here - we buy or sell a Randall knife on an almost daily basis now, and I spend several hours a day, each and every day, uncovering new knives to buy...
The following worked well for us, and it may work for you - try to make a few bucks on each knife sold, sell a dozen, keep one for yourself, start over....do this daily for five or ten years and you'll likely find that you've amassed a nice collection for little other than the effort...
Then, when you get really addicted, you can start writing magazine articles, reference guides, books, etc...of course, all the upfront publishing money will have to come from selling your knives - then all the money made from selling your book gets rolled back into buying knives...lol
Remember tho', family comes first. You can go without food, but if you have no family then you'll have no one to feed ya
Good luck, it never ends, there is no cure...