I don't want this to come across the wrong way (and I appreciate your experience greatly), but I have no idea why I'm getting the "...you should have multiple females and multiple males so you do not gamble everything on a specific pair" advice. I am fully aware of that, and besides - I'm not gambling anything. It's fun!
In my small collection, I only have 4 males (1 under-sized, another not in rotation) and 12 females (over half are under-sized). This male was a spectacular unexpected pickup over the summer, and because of that I only have one female (Enchi) ready for this guy (Pastel Clown) at this time.
For my other pairing last week (Enchi Fire YB x Proven Normal), I got to see my first lock ever! That guy's got a comparatively full slate lined up, so I'm thrilled that he took right to it.