They put the button far away so that you go out and buy one of their foot pedals. On top of that, people that design these things are engineers, not gigging musicians!
As genesys said, if they designed it right the first time, what would entice you to buy the new model.
Finally, YES they do it on purpose. Millions of dollars are spent on market research and methods to reach into our pockets, for as little cost as possible. They will not spend any money to create something new and spectacular because they know that we will buy their stuff anyways. In a sense, one could say that they are exploting our emotional attachment to music and new toys!!!
They know exactly what we would like to have in a keyboard, but it is so much more cost effective to include it in incremental steps.
[This message has been edited by hitman (edited 02-10-2010).]