I'm just worried I'll end up on the worst sharers top 10 list lol
It takes a lot to get there. You basically have to spend the first week downloading a ton of stuff (since you are not limited in your downloading until a week in, IIRC) and then seed absolutely none of it back.
In other words, you have to be a complete asshole. Which I'm sure you aren't.
Anyway, focusing on low seeder stuff isn't a bad idea, but if it's unpopular stuff that no one leeches, you'll end up with the same problem. The key is the seeder to leecher ratio, not just seeder count.
And be prepared to seed stuff forever. I've been seeding some of my torrents for more than two years (and that's not regular time, that's active time, i.e. the amount of time BBT has seen me actively seeding). Some are approaching three years.