You're seeing this as a "space-in-general" issue, instead of a FLOOR space issue. Putting something on your bartop is so insignificant. Putting something in your room that takes up FLOOR space can be a big hassle. Picture the guy who has a game room with a bar in it. Let's say they have a pool table, and putting even a cabaret in there could and would get in the way. Having a bartop solves that problem while still allowing gaming goodness. Then, you've got the folks who DON'T have a gameroom, would like a cab but just flat don't have the FLOOR space in their house, the wife doesn't want a machine that takes up that space, they want something they can bring out at parties, or they just flat out hate a laptop/desktop CP and figure they'll create something right in that middle ground.
There's TONS of reasons and situations people would build a bartop. They obviously aren't an issue for you, and for others such as myself, who have a full-sized cab in their living room and a wife who tolerates it, but they clearly are a solution for a minority of cab builders.
Why build mini cabs for kids who are going to grow and make that cab unuseable? Like many things we do, it's BECAUSE WE CAN!
