I played around with this, and I'll tell you where I have problems. It's similar to the thing in AI where if you model a character as cartoonish, people's subc

I played around with this, and I'll tell you where I have problems. It's similar to the thing in AI where if you model a character as cartoonish, people's subconsciouses will fill in the blanks, making the characters appealing -- but if you get 'too close' to actual, then the brain only sees the flaws, and it makes the characters seem creepy. I feel that same thing here, where you're using actual HTML input elements, and actual page items, but without being able to repeat a background, and without being ACTUAL html. I only see the flaws. Balsamiq works best for me because frankly, I'm not going to use the browser's default HTML elements anyway, unless I've styled them at least a little bit. So the 'cartoonish' rough markups you are striving to improve upon are really features to me. That said, I don't think there's no market -- I'm sure the idea will appeal to some, but I don't know that the pixel-perfection is particularly a value add for me, it's just a different choice, and (for me) not paying any extra for.