We have had a couple of questions like that before. This is my first and I did not want to go too low and disappoint a SB but once I started buying a few things, I saw it was not going to be a problem. I also saw that it is not the dollar amount as much as the thought that goes in to the choices that is important to those on the receiving end.
Each item I have purchased has been almost like a gift to myself because it was so much fun to pick out and imagine a SB enjoying it. Now that I know who I am buying for and can personalize my package, I will wind up going way over but I have decided not to total it up either. From the beginning I have felt like this will be guilt-free spending since it is for someone else!
I haven't done much detective work, but now that "Toy" has brought that up, I think I too, am going to add a new facet to the enjoyment of the GE and try to get to know more about my SB!