I respec'ed to level 10 in Alchemy and Merchantile for this and here's the numbers I calculated. In a lot of cases, the cost of a potion is less than the cost of its constituting ingredients. You can decide for yourself which is more valuable here.
Potions:
Potion Cost Ingredients Cost
Greater Damage Boost 1251 1550
Master Healing Potion 969 1329
Master Mana Potion 969 1329
Master Magebane 915 1580
Master Experience Booster 915 1552
Master Freezing Sentinel 915 1545
Master Magic Amplification 915 1538
Master Flesh Eater 915 1526
Master Hardened Shell 915 1526
Master Mana Sap 915 1526
Master Frostbite 915 1524
Master Frostguard 915 1496
Master Magic Precision 915 1489
Master Force Potion 915 1484
Master Burning Sentinel 915 1482
Master Lightning Sentinel 915 1482
Master Steeled Curtain 915 1475
Master Blazing Salve 915 1461
Master Jeweled Shilelagh 915 1461
Master Lightning Storm 915 1461
Master Social Grace 915 1461
Master Current Stopper 915 1454
Master Flameguard 915 1454
Master Precision 915 1453
Master Piercing Serum 915 1448
Master Blacksmith's Craft 915 1419
Master Dispelling Boost 915 1419
Master Thief's Cunning 915 1419
Master Tracker's Draught 915 1419
Master Bleeding Resistance 915 1418
Master Venomguard 915 1418
Master Serpent's Venom 915 1407
Master Slashing Fury 915 1407
Master Sorcerer's Intelligence 915 1393
Master Alchemist's Art 915 1383
Master Assassin's Evasion 915 1383
Master Merchant's Command 915 1383
Master Warrior's Strength 915 1339
Master Healing Regeneration 915 1329
Master Mana Regeneration 915 1329
Minor Damage Boost 474 212
Fate Potion 346 5004
Greater Damage Deflection 346 1463
Greater Phasewalk 346 1363
Greater Freezing Sentinel 346 294
Greater Magebane 346 280
Greater Experience Booster 346 273
Greater Frostbite 346 273
Greater Magic Amplification 346 259
Greater Frostguard 346 245
Greater Burning Sentinel 346 231
Greater Lightning Sentinel 346 231
Greater Flesh Eater 346 226
Greater Hardened Shell 346 226
Greater Mana Sap 346 226
Greater Steeled Curtain 346 224
Greater Blazing Salve 346 210
Greater Lightning Storm 346 210
Greater Force Potion 346 205
Greater Current Stopper 346 203
Greater Flameguard 346 203
Greater Magic Precision 346 189
Greater Piercing Serum 346 187
Greater Jeweled Shilelagh 346 182
Greater Social Grace 346 182
Greater Bleeding Resistance 346 167
Greater Venomguard 346 167
Greater Serpent's Venom 346 156
Greater Slashing Fury 346 156
Greater Precision 346 153
Greater Sorcerer's Intelligence 346 142
Greater Blacksmith's Craft 346 140
Greater Dispelling Boost 346 140
Greater Thief's Cunning 346 140
Greater Tracker's Draught 346 140
Greater Alchemist's Art 346 104
Greater Assassin's Evasion 346 104
Greater Merchant's Command 346 104
Greater Warrior's Strength 346 88
Greater Healing Potion 346 78
Greater Healing Regeneration 346 78
Greater Mana Potion 346 78
Greater Mana Regeneration 346 78
Liquid Seduction 163 105
Minor Damage Deflection 131 125
Minor Phasewalk 131 122
Purification Potion 101 118
Minor Magebane 49 154
Minor Magic Amplification 49 154
Minor Experience Booster 49 147
Minor Freezing Sentinel 49 147
Minor Frostbite 49 147
Minor Steeled Curtain 49 147
Minor Flesh Eater 49 118
Minor Hardened Shell 49 118
Minor Mana Sap 49 118
Minor Piercing Serum 49 108
Minor Blazing Salve 49 105
Minor Burning Sentinel 49 105
Minor Current Stopper 49 105
Minor Lightning Sentinel 49 105
Minor Lightning Storm 49 105
Minor Frostguard 49 98
Minor Magic Precision 49 84
Minor Flameguard 49 77
Minor Jeweled Shilelagh 49 77
Minor Social Grace 49 77
Minor Sorcerer's Intelligence 49 76
Minor Bleeding Resistance 49 69
Minor Force Potion 49 69
Minor Serpent's Venom 49 69
Minor Slashing Fury 49 69
Minor Venomguard 49 69
Minor Precision 49 66
Minor Blacksmith's Craft 49 56
Minor Dispelling Boost 49 56
Minor Thief's Cunning 49 56
Minor Tracker's Draught 49 56
Minor Warrior's Strength 49 40
Minor Alchemist's Art 49 38
Minor Assassin's Evasion 49 38
Minor Merchant's Command 49 38
Minor Healing Potion 49 30
Minor Healing Regeneration 49 30
Minor Mana Potion 49 30
Minor Mana Regeneration 49 30
Ingredients:
Essence of Fate 1251
Edelweiss 49
Leechwood Bark 49
Prismere Dust 49
Scarwood Bark 49
Seaflax 49
White Flake 49
Ysa's Breath 49
Bloodroot 28
Eel Petal 28
Scarab Salts 28
Sky Blossom 28
Star Thistle 28
Tindertwig 28
Black Cohosh 10
Cripplespore Caps 10
Embereyes 10
Sativa Fibers 10
Scarlet Flowstone 10
Softscrabble Powder 10
Here's the raw data I used to calculate these numbers.
