I don't know much about the sponsorship part of it but I have had a few things come my way (I thank them for that). That was because of the products I use and catch with I believe in. When someone asks about rods,reels,lures,line and how to. I tell them what has worked for me (that's all I know). I was just being helpful, I had no idea anything would come from it but it did. I am not really sponsored but you can say I have a toe in the door LOL. I do get a few kick backs.
I am happy for anything that has come my way. I have been told that at age 42 I was to old for sponsorship LOL! I tried a two years ago to get some sponsors (now age 44). So if you are younger maybe it will help. I would think it is harder for someone to seek sponsors then sponsors to seek someone. If you are looking for sponsors to save money you are looking for the wrong reasons. Catching big or lots of fish helps but is just a small part of it. If you can help them in some way they will most likely help you in return.
Good Luck.

Don.