Estimate for comparing gold foil to regular foil prices

Prices grabbed from splintercards.com. This shows what kind of premium you pay buying the gold foil version of each Chaos Legion Summoner at max level compared to the regular foil.

Quix max $299.09
Quix GF Max $836
2.79X

Thaddius Brood MAX $293.135
Thaddius Brood GF Max $664
2.26X

General Sloan Max $251.85
General Sloan GF Max $547
2.17X

OBSIDIAN Max $324.3
OBSIDIAN GF MAX $850
2.62X

KELYA FRENDUL MAX $435.85
KELYA FRENDUL GF MAX $791.5
1.81X

TARSA MAX $323.15
TARSA GF MAX $643.5
1.99X

Regular max full $1927.375
GF max full $4332
2.247X