I played warrior on impossible - went for undead army. I had hoardes of money - till I made the quest for dwarven prince - no matter how much gold you accumulate, no matter on which difficulty - system of purchuasing the Magic Crystal, or Might, Mind/ Maig Runes is great for anyone who thinks he has a lot of gold.
buy first magic crystal for 100K, second for 200K... 10th for one million... you spent 10! [factorial] of gold - if you still feel rich, keep buying
Luckily the good point about undead army is that you need very few skills also very few of spells - so I never had problems with runes or crystals (as well with money) - so even if I had trouble in some battles and would welcome some "cheating" like : "buy another Sacrifice use in the same round for 1M of gold even if I am warrior" would be welcome, still not so much needed.
Just for fun, (and this is in many games) what could be added is :
1. buy your own castle
2. order unit you desire to be replenished in your own castle (so for a lot of money you would have black dragons in your castle each week for purchase)
3. buy visual alternations for your own character (buy different horse, different haircut etc.)
4. Buy your own flying ship for free air travel
5. Desing your own castle interior
and so on
But for the combat system, I liked the money system, sometimes you feel poor and have to sell a lot of things sometimes you get upset when you find "only" gold in chests (crystals or runes would be better)... this is the type of diversity that is absolutely refreshing. I had to play the game many times till I found "legal cheating" - getting ultimate and cheap army and going through battles with best results and minimum causalties.
I still wonder if GOLD is counted in the final SCORE.