Posting here that you have 50 hives is hardly showing off, to be honest. That's a lot compared with most "hobby" beekeepers, but nowhere near the scale of some (including others who post or have in the past posted here).
The impression I have from someone I know who currently has 100+ hives is that you just have to be very organised, focus on the jobs that are absolutely necessary and do them as efficiently as possible, make sure you have the necessary gear to make it work and just crack on. He's fortunate enough that his dad has a barn where he can store kit, but otherwise he'd rent one from a local farmer I'm sure. Some sort of four wheel drive vehicle and a trailer are necessary for moving kit to/from/between sites, and he does pay a mate to help him with the grunt work when doing some of that (or possibly they just exchange a few days work with each other). He works hard, but he's trying to build the operation up to the point where he can (mostly) make a living from it so it's not currently his only job. I very much doubt he bothers with stuff like nadiring supers and suchlike. It's too much work. I'll try to remember to ask him what he does with unsealed super frames next time I see him. I'm not actually sure he bothers too much with the likes of hive stands either. And once the supers come off for the last harvest, that's it: they'll go in the barn after being extracted and sit there until the spring. If a colony is weak then it will be united with another or something similar. There'll be no attempt to save it. Far more economical to replace it with another raised from a more productive colony.
If you have limited space for kit you're not using perhaps one of those small "garden stores" would provide the storage you need. Or build one yourself if you have the skills. The need for storage space is pretty much unavoidable once you start keeping bees.
James