I don't think it'd ever be worth it.
His quality of fish are what you will find at petsmart. (Petco has better fish than him IMO). And for what some of his fish go for, you could import a great fish from a legit breeder for the same price! I think he is a 100% scammer.
And I know that some people have added a male with females and have had it be successful. But he is suggesting people that are completely inexperienced do this, and in a 10 gallon! I can understand maybe trying it in a heavily planted 20+ but a 10? That's volatile enough for females only.
Also, the Facebook name is "betta bids auction, USA. Lower 48"
I only mentioned this because I've seen so many requests for the name.