Benchmark your expenditures for IT Infrastructure against your competitors.
Many companies are quite open about their innovative expenditures on IT.
If competing firms try to keep IT expenditures secret, you may be able to find IT investment information in Public companies.
Your firm does not need to spend as much as, or more than, your competitors.
Perhaps it has discovered much less expensive ways of providing services, and this can lead to Cost advantage.
Alternatively your firm may be spending far less than competitors and experiencing commensurate poor performance and losing market share.