Drain cameras, what am I missing? $100 vs expensive options

[Paul Smythe]

I've had some plumbing issues and am looking at buying a cheap, $100 camera on Amazon (example: https://www.amazon.com/Industrial-Endoscope-Oiiwak-Inspection-Waterproof/dp/B081J3LN61/ref=mp_s_a_1_8?keywords=drain+camera&qid=1579998402&sr=8-8). What am I missing here? Normally these things cost hundreds to rent and I've seen cameras online that cause thousands.

My question is primarily, what about this $100 camera is inferior? Is it not as durable or high-quality? I know of plumbers that don't even have cameras, I assume because of the high cost.

Would love input from the community on this.