I agree Nino, I'd much rather start a collection today than 3-5 years ago, I did pay a lot more for games back then that I can find much cheaper today.
Some people consider pinballs an investment, but truthfully they will never really go up in value much more than inflation, unless you have something that is truely rare it will not make you a millionare any time soon.  Even existing rare games peaked in their values a few years back and I'm sure would also be cheaper at the moment.