Yes Connected, that practice sounds like it is relevant to both businesses. If you want to sell a house, fix it up. If you want to sell a website, fix it up. You wouldn't buy a house with a bare lawn just like you wouldn't buy a website with a bare landing page.
Yes definitely. In fact, the only difference between your house and internet real estate is that one is tangible and the other isn't, otherwise in all other aspects it's the same. The more work you put into it, the more you can sell it for.
I don't think that it's alright to say that the more work you put in to your site the more it's going to be worth. As in a real house, it's the quality of work that determines the value of the property and this applies to online property too.
Yes, but with a house what it sells for is affected by location, condition, the market, how good the work is etc, not just the work you put in. It is the same with websites. If you put a load of work into a site that no one wants it won't sell for very much.