Its a slow long grind compared to eBay but its a great form of constant income for buying cards. Prob stay between low-mid end, cos high end dont move for good prices.
You can get better prices for low end cards than ebay because the buyer doesnt have to pay an additional shipping fee like ebay. They can let it pile up til its a worthwhile shipment.
Keep in mind you lose 20% if you 'cash out' to paypal, but if you wanna buy from comc its fine.