fake teleports do not work in 90% of the cases, well at least that's my experience, I do it all the time, but ppl never react to it, well they do sometimes, not often
I do agree that teleport scrolls are important, but I think cap locks might be even more important
tele ganking won't win you a game, well it could, but you'd need lots of tele ganks
locking portals / enemy gold flag will win you a game (on cataract 3v3 that is)