Totally agree, I started handling my friends like this:
in case they invite me aproximately one day in advance - OK, I prepare for the challenge (it happened 1 time in 9 seasons...)
in case they leave me alone regarding friendly matches - OK, nice
in case someone force me to play "friendly" - I reject him from my friends' list; I am not improving my team to be a crash-test-dummy for teams of very rich managers...
(Note: by "force to play friendly" I mean this practice when someone "invite me" to play friendly match i 4 or 5 minutes, I am spending more than 2 hours a day of net time by playing T11, but I usually cannot cancle match in 4 minutes... e.g. by the midnight)