Out of the bettas I have had... 4/5 VT made nests and would flirt. 1/5 of any fancier ones would :/ this time, between 1 doubletail, 1 veiltail and 1 halfmoon my halfmoon is the only one to make a nest UNLESS a female is visibly present. Then they all do!
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.