Moving between limits - question for top players

[AZK]

I talk with a number of you via PM/IM and find that many of you play stakes across the entire spectrum. I mean I know a few of you are rolled for the biggest games on the internet yet sometimes dabble in a little 2/4, or regularly play 5/10 even though you are rolled for 50/100. If a game is short or full or has good players, tight players, bad players, it doesn't matter. Some of you will even have 1 2/4 table up, 2 5/10s, a 10/20 and a 25/50, or any other combination. One day you could be playing 50/100 and win 20k, the next day you are up $20 at 2/4.

It is impossible for me to do this. I do not understand how you people can do this. If I am a regular 5/10 player, I find it very difficult to concentrate and take lower limits seriously. Once I move to a level, it's very hard for me to move down to a level even if it's a good game because the money (win or lose) becomes insignificant. When I started playing seriously online, it was impossible for me to play .25/.5 with friends, I couldn't take it seriously, and that was when I was playing 1/2 online. Now I couldn't even think of sitting in a 2/4 game because I can only win or lose $400...I have a feeling this is not going to end. While I am competitive and like to win, the money/stakes is also a major factor. I find that I grow a tolerance/immunity to the amounts of money after playing for so long. I won't be able to play as much this year, so this will likely go away (or worse, turn into needing to make a huge score since I can't play as often), but even this summer after playing 5/10 for weeks straight many hours each day, winning or losing $1000 started to not feel as much as it once did. When making decisions/playing I am only thinking in bet amounts, but at the end of the day I am not satisfied with amounts of money I used to be satisfied with. I know a lot of people go through this and it's normal and sometimes it's just how it is, but I can't help but feel that I would improve as a player if I had some way to move over this hump.

Further question, This is obviously going to be way too general of a statement, but of most of the players I know - The ones who can go from 2/4 to 50/100 and back, are better, more solid, winning players. Why do you think this is?