The analogies weren't about the price of the stand as a fraction of the bike cost, although I can see how my comments could have been read that way, sorry for the misunderstanding (god help me with the puns).

I had two points:

1) Any mode of stuff-conveyance without a good way to hold it steady while loading/unloading cargo is broken. Of course the design of one vehicle vs. another makes the engineering problem of holding it steady while stopped more or less difficult, and therefore more or less expensive) to solve.

Cars/trucks/tricycles have cheap "stands" because they already have three or four points of contact with the ground, all you need is a parking brake. A motorcycle or bicycle, however has the added complication of the stand needing to provide a third (and maybe fourth) point of stability which must be off the frame axis. Motorcycles have relatively inexpensive stands due to having some width in the frame so the stand doesn't need to be a lateral structural member. Bakfiets and the Madsen are similar. Xtracycles are inbetween those and a normal bike because there's a little width (which it utilized by the KickBack), but it's really not enough for large loads. The Rolling Jackass solves the engineering problem without relying (much) on frame width. That's why it's expensive.

2) Even if it costs 10% of the cost of the bike, it provides much more than 10% of the usefulness of the bike. To look at it from the other side, if you love everything else about your longtail and the only thing that frustrates you is loading and unloading because it won'st stay upright, then for a mere 10% premium in price you can reduce your daily frustration by 100%!

Good deal!
-Dave