Kylander, you have over 700 players on your friends list. You belong to a CC with a good number of German champion tier players. When you are looking at your start page I would have to assume that the list of green and red dotted friends is fairly long. Are you waiting for an invitation or are you sending invites to others?
When I really want to play alternate shot I generally get into a game, even if I go random. I do find that lower tiered players are sometimes worried about playing on champion greens so they have set parameters that exclude higher level players in random multi-player games.
And champions searching for players for random games are likely to restrict their partners to champion or TL tiers since they might be worried about quality of play.
If your "friends" always turn down your invitations you might want to consider culling the list so that it only contains players that are willing to play multi-player games. Why else do you have friends? Personally, I try to make sure that if I can't play in a multi-player game I am not green. Then when I am green I will actually be ready and willing to play. That's what friends do.