Then the only way you could force what you wanted would be for the tails to count you have to either... queue solo in DF, or have at least one newbie and do it at minimum ilvl sync (however for the latter people would just create alts and use jump potions once Stormblood comes out, and still only run it with friends). Do either of those, and even if you offered gear 300 item levels higher than the highest ilvl otherwise available, people would still refuse to do it. Because no amount of incentive would make people do that.