I can actually see an advantage to knowing what my friends (or top profiles) are investing in. There are certainly no guarantees with it, but if you were invested in one fund, and maybe 10 of your friends were, and then suddenly 5 of them dropped off... you might have a look as to why half of your friends were moving away from that fund, what had they read or heard that you hadn't.

i suppose if your friends were trading everyday, the value in that would be tiny, but for longer term investments, seeing the herd mentallity might make it easier for people.