you could end up with a 100 or more bettas that way....
honestly it is better to save your money and breed the best or better....because if for some reason you cant keep all the babies then there will be more demand for the higher quality and this possible insures a better life for your fish. I am not trying to sound like a jerk, or say your fish arnt as pretty as can be, but let me give you a non fish example.
my husband and I have 2 horses, a 18 year old QH and a 4 year old paint, we will someday be breeding the paint mare for a baby to replace the older horse when he someday dies. but we are going to save our money and breed her to the very best stud we can afford...because even though we plan on keeping and raising the baby as our next ridding horse....something could happen. my husband could get injured and loose his job, heck one of us could die and leave the other as a single parent and in that cause it would be unreasonable to keep 2 horses and raise kids on your own. and the simple fact is a higher quality animal has a better chance in life then a grade or only mediocor animal...both can be abused and mistreated by idiots, but truely if somebody is dishing out a higher price tag...thay are more likely to take care of what they bought.