Pipeline (sales) velocity tells you how fast you're generating revenue and customer winback delivers tremendous sales/pipeline velocity.
Winback velocity is high for 3 core reasons:
1) The win rate for selling to past customers is 5X the win rate for selling to new customers.
2) The deal size for past customers is 120% of the deal size of new customers.
3) The sales cycle for winback customers is 3X faster than with new customers.