These two pools often do not intersect.
Anyways, it's a hobby, I can't tell if you want to earn from your hobby, or if you want to reduce the losses/input into the hobby.
If it is the former, my advice is that mixing the two ("earning" and "hobby") guarantees that you won't enjoy your hobby, because it means that your decisions for the hobby will be guided more by $ rather than enjoyment - don't believe that crock of **** that some people sell about "having a job that you're passionate about means you'll never work a day" - only a select few get to climb to the top and do whatever they want, and people seek them out and they are able to call the shots. Just forget about calling it a hobby and just focus on resale value, see if you become a grey dealer long term. Then just buy whatever is hot, establish the contacts, don't bother with this idea of "what I like".
If it is the latter, my simple advice is to go second hand. If you buy low, and let others take the loss for you, you won't lose so much.
Can't have your cake and eat it too, no such thing as that..