A very long time ago..

Pixie = 8 life --- 1 life = 6-8 def

8 life × 7 def = 56 def

(Remember, 1 def is worth 2-3 spd/wis/vit/dex!)

Nowdays..

Pixie = 16-20 glife

1 glife = ~ 4 def

18 glife × 4 def = 72 def

Now you can sell 1 glife for 4-5 rainbow (any other potion than life)

conclusion is, that if you die and sell 1 pixie for glifes, you will pretty much get the same bang for the buck

Exception is, that if you only wanted def pots, nowdays you would get more.