What is the Current Insured Limit and why is it limited to a Fixed Sum?

What is the Current Insured Limit and why is it limited to a Fixed Sum?

The insured limit is currently a maximum of ₦500,000 for each depositor in respect of deposits held in each insured Deposit Money Bank (including Non-Interest Banks) and Primary Mortgage Bank and ₦200,000 for depositor in MFB in the same right and capacity. 
The amount to be reimbursed has to be defined.  Limited coverage is to minimize moral hazard through excessive risk-taking by bank management and depositors.  Unlimited coverage could constitute a perverse incentive for excessive risk-taking.