Some teams who are playing legitimately may be doing some of it with drinks. If you serve 5 drinks per day and always make the 4th and 5th drinks for blue ribbons, they are worth 40 and 50 blue ribbons respectively, for a total of 90. You’re going to want to look at what’s cheapest and start there, and serve accordingly. It would cost 84 diamonds to serve 5 drinks (or 88 if you have to skip the free one, which you would have to do if it’s for blue ribbons). If all 15 players serve and pick up all 5 drinks, that’s 18,900 blue ribbons for the team: 90 x 14 (can’t drink your own, of course) = 1260 x 15).