Honestly, you are going to have practically no market for any resulting fry out of a cross with either of these males. Blue and red VTs are about the most common type of betta available and so their price usually reflects this.
As to keeping them all peacefully in a 100 gallon tank, you are more than likely only going to be able to do that with the females. Also to really get the best finnage it's advised to jar out the males. Once they have been jarred however, you are going to have a lot of difficulty re-introducing them to your main tank.
Are they the permanent homes of your bettas? If so you are going to need a heater unless you are keeping your room at a toasty 80-82 farenheit 24 hours a day.
Judging by the questions you have been asking I would say you need to do a ton more research before even attempting to spawn your bettas. Fry need to be fed live food several times a day, so you need to purchase live food cultures in advance and get the hang of hatching BBS on a daily basis. It's not just as simple as putting two bettas into a tank together and having them spawn. One or both fish can be seriously injured or killed if your fish are not conditioned correctly or you being inexperienced, misjudge when they are ready and release your female too early.
Don't want to sound like a Debbie Downer, but please do some research. If you can't tell that these bettas are both male you definitely shouldn't be thinking of trying to spawn them right now.