The hard part about trying to sell these types of models is that there are a lot of good ones freely available on the net (same goes with wood textures). Your models are pretty good, but they look a little too "clean"...they need more details and variance, like scratches, dents, chips or splintered pieces.

I can't really see myself buying such a pack because all the models in my game need to look of the same style, and if I have just a few chairs and tables that look completely different from all my other models, it doesn't look very good. In other words, the pack would need to be more comprehensive

I think your pack might have more commercial appeal if you made it a house/furniture pack, and then added more styles of beds, chairs, tables, desks, etc so that people could make an entire house scene. Then, all the models would have the same style and it would look really good. I would be willing to buy such a pack for $15-20 if I was working on something that required a furnished house scene, as long as there were a lot of varied models (you can just duplicate models and make slight variations to the size and texture/colors).

I hope that's helpful, obviously just my opinion.