To some degree yes. Many members of the Ethereum foundation have made large profits from the price of Ethereum going up. They have also taken a cut from the more scammy ICOs by acting as advisors (brand ambassadors).

Furthermore the Ethereum foundation itself has been spending a lot of its reserves on research grants and other activities that directly benefit the members without providing much benefit to the public at large. Under Swiss law it should be audited regularly however no audit had been published publicly.