Sportlots is still among the top card sites for buying/selling, but I agree that they can do better. I found typos that they don't bother to fix, some cards with two or three players are listed under one player and all hockey sets are listed as 2020 Upper Deck or 1971 O-Pee-Chee instead of 2020-21 Upper Deck or 1971-72 O-Pee-Chee as it should be.
Also, they could start their base price lower. Maybe 10 cents instead of 18, additional volume of sales would make up for the difference or if they don't want to lower their base price, add a "make an offer" at the end on the total, not just on the individual card pages.
SET BUILDER: Baseball ◉ Hockey ◉ Misc. Sports ◉ Non-Sport & Oddballs
PC: Felipe Alou ◉ Derek Aucoin ◉ Steve Begin ◉ Jennifer Botterill ◉ Kevin Dineen
L.D.T. ◉ Bob Kudelski ◉ Manon Rheaume ◉ Gabriela Sabatini ◉ P.J. Stock