In Q2 2022, solar volume spiked 50% (90K→135K leads). Sell-through crashed from 99.6% to 82.1%. The business permanently shifted from supply-constrained to demand-constrained.
Solar RPL climbed from $134 (2021) to $219 (2025). Roofing RPL went from $163 (2023) to $213 (2024). Higher per-lead prices partially offset sell-through declines.
Every year, Q3 (summer surge) brings the lowest sell-through. 2024-Q3 solar hit 74%, 2025-Q3 roofing hit 69.8%. Budget cycles and buyer vacation patterns are structural headwinds.
Key Finding: In 14 out of 16 quarters where volume grew >20% QoQ, sell-through dropped. The only exceptions were periods where major new buyers were onboarded (Q1 2025 roofing: +39% volume, +4.7pp sell-through). This confirms the fix is buyer recruitment, not lead quality.
Effective Yield (revenue per total lead generated) is the metric that matters most. Solar yield peaked at $184 in Q1 2023 and is now at $161. Roofing yield peaked at $176 (Q1 2025) and fell to $108 in 2026. This means we're earning less per dollar of ad spend even though per-sold-lead pricing is up.