I envy you guys with cheap shipping costs. I’m in Canada and I’d never risk shipping untracked, but I think having two separate accounts is a great idea @Kampes_Cards. A seller recently shipped me a card in an enveloppe with a stamp for $7 shipping. It was a great total price though, I don’t have time to ask for $5-6 back and I’m too honest to state I didn,t receive it but that was a bad experience and if they ever list something I want again, I’ll probably pass… unless they give me some kind of major discount.
Having a second account would help me list cards that I’d otherwise bundle together and get next to nothing for. I recently got about $10 USD for 18 vintage mostly NM holos. I just know people aren’t going to pay $10 shipping on $5-10 cards so I thought I’d go the $0.99 auction route and get an easy $50+. Oops. 
I’m still learning and I’m testing with product that I got pretty much free. I’ve came across some really great advice on efour so far.