Same here - 7 of the eight. I don't have the drain auger.
Obviously it depends on how often you use all of those tools - and in my case it's pretty often.
Not sure about rental rates across the country - but for me they're pretty steep.
For instance, I always thought it'd be cheaper to rent a floor drum sander, but having done about 10 different (mine and friend's/family's) floors now, I SHOULD have bought a good used one for what I've spent.
Even if I never need it again, I could sell it and recoup most of what I had into it. I'd now be ahead by thousands of dollars.
Live and learn.