I agree, I never even build a bank! the interest rates are just illogic and discouraging. I would consider loans though if the interest was under 20%. Also I would vote for a dynamic interest rate depending on the date of payback.
Like if i get a 100,000 gold loan i could pay it back in...
- 1 Day = 10% Profit
- 2 Days = 20% Profit
- 3 Days = 30% Profit
etc. this way it would be more enticing for players to take loans and payback quickly. and paybacks should be voluntary not automatic with a maximum due date. if the loan is not paid by then then it would be forced on the kingdom with a penalty. something like mass desertion of the army or something.