f you want a better chance at gaining higher astrals and getting more bang for your buck so to speak then set up your astrals so that you sell everything blue or less. The reason for this is with any luck you will get alot of blue and since blue is worth 30 exp and 6000 gold you will be making a profit and regain all or most that you have lost. On top of that you will have a much better chance at gaining orange and purple astrals which are worth 50 and 70 exp and you will gain a decent amount of star points boosting you up higher.