Intuition - Why does elasticity vary along a curve?
Think of it this way. A yacht costs $\$0.01$. How much do you demand? Then double the price. Now how many would you demand?

Then consider something closer to a market price. Something in 6 or 7 figures I guess. If you've got some money, you might buy one at the market price. But then if that price doubles, wouldn't that affect your demand a lot more than the 1 to 2 pennies change?

Simply put, as you go up the demand curve, the same percentage change in price is a much bigger absolute movement in price.