His argument is "I could buy any SaaS service I liked by simply clicking 'Subscribe to Foo-SaaS for 99 / mth' on my AWS dashboard."
This is true - it would solve his needs immediately and would yes lead to thousands of sales.
For about a week. Then every purchasing dept in the Fortune 500 would collectively spray their coffee over their monitors, and suddenly one of two things would happen a) AWS would offer Enterprises a "turn off that Sht" option (at a cost) or b) every purchasing department would add even more hurdles* before you could pay out.
Yes, it is hard to buy stuff in a corporate - but it is not a bug its a feature.