I think this word is tripping up a few people:
con·spir·a·cy [kuhn-spir-uh-see]
noun, plural con·spir·a·cies.
1. the act of conspiring.
2. an evil, unlawful, treacherous, or surreptitious plan formulated in secret by two or more persons; plot.
3. a combination of persons for a secret, unlawful, or evil purpose: He joined the conspiracy to overthrow the government.
4.
Law an agreement by two or more persons to commit a crime, fraud, or other wrongful act.
5. any concurrence in action; combination in bringing about a given result.
Key thing to note here is the element of a group of people working together (meaning they are in contact and in agreement on a course of action) to ensure 'the rich get richer and the poor get poorer' etc. I would agree with what Cory is saying in that I do not think it is a conspiracy in the actual sense of the word. It is something born of greed.
I guess I just can't see the type of people who seem to make up the "rich crowd" forming some kind of secret worldwide society where they meet for tea monthly and discuss world domination. Sorry that was a bit of a straw man, but I just don't see it happening. These people are fueled by greed, with a desire to beat the competition and leave them in the dust, not make friends with them and share business plans. It is exactly this lack of cooperation between people in this '10%' that would make a large-scale conspiracy impossible.
Also there are quite a few people who are rising to riches nowadays, think of those in the area of computer science, acting, or sports, who came from families that were not rich but now own quite a vast sum of money. They possess skill sets that allow them to earn high wages.
However I do agree that the 10% owning 90% of the wealth (is this an actual statistic? I have never seen one of these referenced with an actual census or anything. If anyone is aware of something that shows actual data I would love to see it so definitely make me aware of it) is an unfortunate and uncomfortable thing.
Here is an article on this topic that I thought was rather interesting.
There will always be people with power (in this day and age money equals power) and there will always be far more people with varying degrees of it or without it completely. Humans are greedy for power, the ones most compelled by this work to satisfy their greed for themselves alone, as it is a selfish thing. Some may pass it on to their families, some may spend it all at their own pleasure. There may be long lasting family lines that have been and will be wealthy for a long time (I'm thinking royalty especially here) but I don't think there is inherently a conspiracy within that which could control our lives. I don't think the long standing families are the only members of the '10%' or that they control everything. There are way too many other people with power to factor in.
SIDENOTE: That website looks like it was made by a twelve year old. One would think a secret society promoting a radical worldwide shift in well, everything, as a realistic possibility would be able to present itself in a better light.