It’s all about quantity
The long-billed marsh wren of North America has very industrious males who build more nests than necessary for breeding. Males with large territories and abundant food build more nests and get more females. Bigamous males build on average 25 nests. Monogamous males build about 22, and even the poor bloke who misses out builds 17 nests in his attempts to find a mate. That’s a huge effort!