Depends on the current status of your store–if a product is doing good, you want to capitalize on that and potentially improve your inventory by finding related products to the best-selling one. Sort of like a domino maneuver. I constantly do research for new suppliers so I'm always ready to add new products should the time call for it.
I think OP is asking if Sellvia plans to add more products. I hope Sellvia regularly adds more products. I'm hoping to add new products to my store every week, keep buyers coming back to see what's new. There's a bunch of clothing that's just added, it would be great if Sellvia could let us unfilter things that aren't applicable to our stores.