On my observation, they open not only easier (eleven flat points), but their returns are weaker at points (5 or sometimes 4). The reason is that an overlay in the bridge is less punishable than in any other game, on the contrary, to do little to do is to pay. Thus, for example, in the fight France against America II, where the Americans brought their most points in the brazen bidding of partial contracts and scarce slams. So the elite in the bridge always tries to grab the initiative, it costs what it wants.