The way I look at it is " How many pairs of undies do you have?"
I have my lightweight hammock for long hikes, my ripstop hammock with micro fleece lining for car camping, my BIG hammock for at home, my spares for loaning out, ect. ect. Then there is the commercial ones I bought to try out but didn't quite like as much as my DIYs or made a clone of and resell. Then there is the spare DIYs to give as gifts.
How many hammocks do I own, hmmm, depends on the day. Right now I think I have approx. 30.