Yea, I know what you mean. I know when I do I usually feel really accomplished with the end result of trying something different turns out really well! It's always a good feeling when and if that happens!
No, I don't have one, as you said they are expensive. I have a Canon A4, it doesn't have this "rising" border on one side, you can scan single pieces and put them together in PS or other programs. It's possible to scan A2 also, but a bit tricky due to some brightness divergences.