AWS's pricing model rewards commitment but penalises inaccuracy. Financial institutions that overestimate cloud consumption locked into Enterprise Discount Program (EDP) commitments pay for capacity they never use. Those that undercommit miss discount tiers that could save millions annually.
The most common overspend patterns in financial services include EDP commitment levels set based on AWS sales projections rather than realistic consumption modelling, Reserved Instance portfolios that do not match actual workload patterns, Savings Plans purchased without adequate analysis of compute usage flexibility requirements, and marketplace spend not properly credited against EDP commitments.
AWS's financial services account teams are incentivised to maximise committed spend. They will present TCO analyses showing cloud is cheaper than on premises, which may be true, but the relevant question is whether you are paying the optimal price for your actual AWS consumption pattern, not whether cloud is cheaper in the abstract.