4000 sq. feet of tools and equipment and I can say the vast majority earn their floor space. I tend to sell off stuff that truly isn't used or takes up a lot of space. That said, I do have some tools and machines that might only get used once every year or two but are still worth hanging on to.
My 12x 24 hydraulic surface grinder hasn't really seen much use. I just don't need to grind much these days. But if a job comes along and needs it, I have it.
My Ridgid 535 pipe threader is one of those tools that might sit for years, but when you need to thread a mess of pipe, there's nothing better than having a good power threader. Only paid $380 or something like that used at auction for it, paid for itself on the first job and now it just hangs out on the pallet racking until we need it.
My 48" Barth box and pan brake doesn't see a lot of action. Most jobs are brake press jobs, but the occasional bracket comes along where I can just bend it up quick on the Barth. Sometimes the old girl will sit for a year without use.
I don't do a lot of woodworking, so my routers and various saws and nailers sit unused for a good long while sometimes.
I've bought some auto service tools to use for a job then never again. I have a coolant system pressure tester, a fancy brake caliper spreader, fan clutch wrench set, and a drum brake service set that I bought for various projects over the years and just sit in the toolbox. I'll use them someday. I just don't work on cars much, but when I HAVE to, I like to have the tools.
For the most part, I'd rather have it and not need it than need it and not have it.