Does coming into a lot of money really change you?

While walking home I passed a pizza sigh bouncer and he was powering his sound system with a portable solar cell device. I asked him where he got it from because I never seen anything like it on the Web or any tech sites. He said he made it many years ago. I asked him why didn’t he patent it and get it massed produced because he would not need to bounce a sign anymore for sure. He said he didn’t do it because he didn’t care about the money, that getting too much money changes people. Do you believe it is really the money itself that changes people or the people change themselves by how they perceive the money, or their relation to it? In other words, do people start to think of themselves differently because of the money? In reality money like knives and firearms are helpful or hurtful by how the possessor uses them.