Just some pie in the skying here,
If you could buy a prefab gaming table would you? What would you want it to do? How big would you want it? Please add your comments.
Let's see. My dream table:
The table is fairly large, call it 48" x 30" (or a tiny bit bigger). It's the height of a typical dining room table. The edges of the table are raised, probably a half-inch to an inch, to reduce the likelihood of dice rolling off the side of the table.
It has a waterproof, scratch-resistant, transparent, dry-eraseable surface. Underneath that, there are four slots for 24" x 15" map inserts. The table comes with four white cardboard inserts, having a square grid on one side and a hex grid on the other; you can just leave them in and draw on the transparent tabletop. However, you can also buy separate dry-eraseable vinyl inserts and use them like Tact-Tiles.
Below the map slots, there are player stations, each with a slide-out tray for character sheets and books, a drawer for dice and minis, and maybe a drink holder. There is also a DM station at one end, similar to the player stations but with more space, and the tray has raised edges like the tabletop - so the DM can roll dice without letting the players see the results.
(And now I find myself wanting to build this thing...)