Well you've basically written my post for me on how it's nothing to do with "experience" and all to do with selfish protectionism.
Easy to say until you are in their shoes. When you have lets say a £250,000 house and 2 kids and want to protect it so you children inherit it from you when you pass, and Mr MP is saying he is going to take some of that away from you, who would you vote for? (by the way thats an example, not representative of any particular political party).