Until someone figures out a way to totally secure domain names other than by having an email address then it will never advance too far and those lending money will only lend a small fraction of the worth.
With a house.....it's not going anywhere. With domain names, you are at the mercy of the Registrar if someone hacks your account and transfers names out. Of course, those who claim to be lending money now are really just buying the names off of you for a fraction of their wholesale value. If you want to pay them back pawn shop rates then they will sell it back to you.
We are a long ways away from being able to get anywhere close to a place where you can get true value for your names, but there are certainly a number of people who will buy a generic name worth 100k off of you for 10k and sell it back to you next month for 12K. That's where we are right now, and it will stay that way for the indefinite future. You could find those deals just by posting on these boards.
The chain of ownership can move with lightning speed with domain names and no bank is going to get into this at the moment. An individual with a good head on his shoulders could build a decent business though.....the only problem is that those people with great names will have a really tough time transfering complete ownership of the names to someone else.
People drop dead once in a while, and there are potential disasters looming for a lot of domainers in this area. It is pretty tough to protect yourself right now if you want to do some estate planning. At some point the beneficiary has to know something about the domain business in order to inherit the names.
This is all part of the same story....an asset class that is still in the Wild West. When you see that the most valuable domain name in the world took years to be returned to it's rightful owner you soon realize that these names will never get to the level of houses, or even cars,when it comes to securing money against them.