well, it's not just a matter of not having space for it overall, it's also a matter of not wanting to have a rig take up too much space. back in my electronic tinkering days (and then in my automotive tinkering days), i've had workbenches set up and they just clutter and clutter and clutter some more. after a while, it's like this old anchor reminding me of what i one blew inordinate amounts of money on. so, it's partly actual physical space, and partly psychological clutter. a buddy of mine has a massive garage / workshop where he does his race car stuff, and i can't seem to get past the "old, cluttered, dirty" aspect of it whenever i hang out at his place.
For physical space, the large the volume you want to crank out the greater the real estate you take up in general.
Lee Progressives are by far the smallest of the progressives, and are the cheapest.
If you buy a Lee-1000 or Loadmaster press new, you also get a set of dies and a manually loaded case feeder (You stock the feed tubes manually, which hold roughly 100 .40 cases). However, I would say a Lee-1000 is only really good for up to 250 rounds/hour with a case collator (which is a very effective and simple case-feed loading tool). Dunno about the loadmaster. The powder thrower is OK, but not truly adjustable like those in more expensive press setups.
Higher end presses cost more $$$ but rates can go 400, 600, 800+ rounds per hour. Mostof the larger presses take up a greater footprint and with casefeeders, a much higher ariel presence.
i guess to make it easier - imagine i'm a banker that likes to shoot and for one reason or another will be reloading. the last thing i'd want is to have reloading stuff that takes up more than the minimum possible space, and invites more clutter and mess.
as to how much ammo i go through: well, the 22LR is a brick each day i go to the range. when i did a "service pistol" day with a few IDPA courses of fire (just starting the whole IDPA thing), i went through just shy of 180 rounds - and i was being conscious of how much i've got left since i only brought 250 with me and didn't want to run dry ahead of time. shooting .40S&W means i can't buy a few rounds from the next guy since they mostly shoot 9mm.
so yeah, for any one caliber (aside from 22LR), i can see myself going through 250+ each week. i might change which caliber i shoot each week, but it'll likely be 250+ of that caliber in that week. i've got 3 calibers to choose from (not including the 22LR which is just target practice stuff)
EDIT (update):
ok, so let's say it's 1,000 per month of whichever caliber i'm running low on. i guess i'd like to be able to do at least 500 in one sitting, and ideally do the full 1,000 in one sit and have it be a done deal for the rest of the month (or at least 2 weeks IF there's a match coming up). does this sound like i'd be best served with a progressive setup? or will a basic turret still be fine for that monthly volume?
How long would a sitting be? 1 hour? 4 hours? How much is your time worth?
Lee-1000 w/case collator: 250 rounds/hour
Pros: Cheapest progressive available (Under $250), small loading area, comes with dies
Cons: Primer feed is a flaw, powder thrower is pre-set volumes, cheaply made (lots of plastic).
I upgraded to a Hornady LNL-AP because of time constraints from a trio of Lee-1000's. The LNL-AP w/ case feeder was 4x the cost of a Lee-1000. Mind you it is easy to do 600 rounds an hour. (I can crank out a round every 2-3 seconds w/o trying.)