Why Bulk SMS Global Rewrites Agency Margin Math on Messaging Retainers

Bulk SMS Global prices SMS on a declining per-message curve: $0.026 on the premium route at 1 to 9,999 monthly sends, $0.02 at 10,000 to 99,999, and $0.016 at 100,000 to 499,999. That means an agency's gross margin on a messaging retainer widens as client volume grows, not as the retainer grows, so the strategic play is consolidating several small client accounts onto one route rather than chasing new logos. The white-label reseller program with custom domains and billing turns that volume curve into a rebrandable product instead of a pass-through cost.