I think it is detrimental for the experienced and vice versa for the inexperienced. Though it doesn't hurt for the experienced to take breaks too. Besides,they could get more ideas from others too.
Part of my PhD thesis is looking to see whether unsophisticated traders (inexperienced, negative return history, small accounts) or sophisticated traders (experienced, positive return history, upper quartile account balance) see any impact from joining the network. The hypothesis is basically that the former gain from an educational perspective while the latter maybe can get some kind of informational edge (improved strategies, sentiment, etc.). It's looking like the unsophisticated folks do benefit, but the sophisticated ones take a serious hit.