If you measure success as getting from point A to point B without the bike landing on the highway then a less expensive carrier is probably fine.
Generally more expensive hitch mount platform bike carriers are:
- Made of heavier material which sometimes results in better durability and less flex
- Better designed / thought-out
- Ease of loading
- Ease of installation / removal
- Availability of spare parts
- Better finish/paint
- Sturdy construction
- Extra features - locking the bike to the carrier etc.
Example 1 - a $90 hitch mount platform bike carrier
Vevor advertises this carrier as able to hold 80 pounds. The carrier itself weighs 26 pounds.
As flimsy as this looks people successfully use this carrier.
Example 2 - The Hollywood Racks Destination Bike Rack - HLY94FR - at around $200.
The unit weighs 20 pounds and will carry a maximum of 70 pounds, 35 pounds per bike. Hollywood Racks does carry some spare parts on their website. Based on the reviews I've read the rack will not come apart on you. Some reviews complain about the ratchet straps and the lack of flexibility in attaching the bike to the rack.
Example 3 - a Thule DoubleTrack Pro XT Hitch Rack running around $500.
The unit weighs 37 pounds and is rated at a maximum of 37.5 pounds per bike. Though it does not carry much more weight there is an extra 17 pounds of material in the rack. Both the Hollywood and the Thule have the ability to lock the bike carrier to the car. The Thule also has the ability to lock the bikes to the bike carrier. The Thule can tilt away from the car with bikes onboard so that you can get inside the back of the car.
Any of these bike carriers will carry bicycles from point A to B as long as they are used according to specifications.
Value is subjective and often difficult to assess if all you have is pictures to go by. Seeing the items side by side so you can evaluate the item being evaluated for your use case generates better decisions.