My disease is mild in retrospect. Not to avoid a conflict of boredom by purchasing MLs that are eerily similar, I made my purchases with a plan. I started buying all the different twists in 50-cal first like
1-66"
1-48"
1-28"
for a nice variety.....

then I purchased MLs in calibers for variety like
45-cal
50-cal
54-cal
58-cal

Being I had all the bases covered outside of muskets and flintlocks that I have no desire to ever purchase, I called it quits.

Now if I sell one out of my collection, I replace it with another from my list. The problem I have now is - what I'm replacing is usually an upgrade -- so it's more expensive.