I've kept female betta in the past, and I have never, ever seen them pop out a bunch of eggs before. Delores' 5 gallon tank just looked like a snowglobe! Then she went around and ate most of her eggs.
I think she would really like to spawn. She also likes to build bubble nests in the hopes, I suppose. And while I also have a male betta, Rojo, I do not want to breed them for many reasons. Two of which are: I don't want Delores to end up injured in the process, and 2. I would feel uncomfortable selling/giving away baby betta to potentially irresponsible wannabe fish keepers.