^This.
Not sure where you live, but even high end used furniture here does not sell for very much money. People who have $3K for furniture generally want to buy new furniture. Period. Especially for things like couches and mattresses. They might be able to unload the electronics, but that furniture, fake plants, and art are going to go for a lot less than they think. Unless they have several weeks to list it and find the right person who wants that style, they might be able to sell it all for $3K, but I'd be shocked if they get more for it than that.
(Source of knowledge: just furnished an entire apartment for less the $1500 with very nice, perfect condition used modern furniture including a spectacular modern leather couch, 2 modern upholstered chairs, bar with granite top and heavy mirror, 2 nice bar stools, dining room set, TV stand/entertainment center, coffee table, end tables, book cases, several lamps, 7 piece bedroom set including queen mattress, another 5 piece queen bedroom set, and 4 pieces of modern art for walls.)
Also, it annoys me that you are just starting out and they are trying to sell you their stuff.