Guys, I've read all of your replies, and thank you for them. When I said waste of bitcoin addresses, I meant that I find it a big waste of addresses to change your address for every payment if they are limited (but a huge number). Like wearing a T-shirt only once for every new day, and then never use it again.

But now I've discovered from you a new problem, I didn't know that two different wallets can generate the same address. If this happens (although I know mathematically is almost 0) where do the bitcoins go? To the first wallet that created the address or what?