The reason I'm interested in crossing wilds with domestics is for the bloodline. Specifically to make a stronger fish. I feel domestics have been bread together for so long that defects and immune deficiency is becoming more common. This is all just speculation and guess work but assuming you bread a wild caught, with a say... Domestic show quality hmpk with a good bloodline you could come out with a truly spectacular fish. I could be horribly wrong but I have a hunch, Mycobacterium are normally an opportunistic bacteria, for example m triplex is found in immunocomprized humans. You don't really hear about it otherwise. Mycos seems to be a relatively new thing in the betta world. Stragely enough it seems to target blue betta. What I'm speculating is ether inbreeding has made the species weaker, or the Mycos mutated. Both are very possible but I still have a hunch that it has to do with the bloodline. Which leads me to believe Mycos aren't infecting wilds because their immune system is stronger. Basementbettas is much more informed than me though and most def knows more than I do. So I'd like to know their opinion.
As for you not crossing I totally understand why you don't, and I think your wilds are awesome lol