Delta management's rip-off-the-customers approach to customers of the DL-NW frequent flyer program(s) is reason enough for me to generally think that flying SkyTeam is only worth it if there is a substantial discount in price+ compared to the competition.
Paying 3x the price to fly SkyTeam? As a DL-NW Platinum SkyTeam Elite Plus, no way that I would ever pay that kind of huge premium unless we are talking about sub-$50 fares.