Same reason I have two 550's.
I have several Lyman case trimmers, once i get one set up for a caliber it stays set up for that caliber and when i reload for a new caliber i buy another case trimmer and set it up for that caliber and leave it set up for that caliber.
I like to hand prime my cases, i love the Lee Bench Prime.
So I bought four of them.
One set up for small pistol primers.
One set up for small rifle primers.
One set up for large pistol ptimers.
One set up for large rifle primers.
I cut the primer box with the primer information and tape it into the primertool base.
i have two Hornady Lock n Load single stage presses set up side by side.
I will resize, take the case out of press #1,
Put it in press #2 flare it.
Then prime the cases.
Then charge the cases. Seat the bullet in press #1, trsnsfer the cartridge in to press #2 , crimp it and done
I have two sets of dies for all of my most used calibers all set up in the Hornady bushings. If i have an issue with a die i take it out of the press, grab the other die set, grab the die I need and keep going and fix the problem later.
I have two Hornady powder drops, one for pistol, one for rifle.
I just grab the one i need, i don't have to waste time changing the drum out.
I buy what ever I need to make my life easier.
And 99% of my reloading equipment is bought used.
When i am done with it I shoukd recoup most if not all of my money back when i dispose of it.
i like the lee hand priming tools too.
Same with them as the Lee Bench Prime.
They are set up for the four different primers.
Plus I have a bunch if extra Lee hand priming tools that i picked up off of Ebay, gun shows or off of the gun forums.
Some people cheap out of reloading equipment.
Some people go way overboard.
I think I am probably a little overboard, but I am sitting back prepaired for what might come up.
If i have a problem i can keep going.
If a friend comes up with a problen, i can loan them what ever they may need and they can keep going.
I ordered a couple of things from ebsy for reloading that will be arriving in tbe mail next week.
It's all good.