malabo,
no there's no requirement for helicopters to be operated Class 1 in Nigeria, but in common with most countries outside cowboyland it's usually illegal to operate a twin engine helicopter on public transport Class 3.
Where do you get the data to support your broad-brush statement
Most operate Class 3, some Class 2, and a very small market segment operates impractically and inefficiently at Class 1.
What's impractical or inefficient about operating Class 1 when one is operating from an airport? These people are advertising a scheduled shuttle service and trying to sell it to embassies and oil companies whose passengers in Nigeria are used to flying in twin engine helicopters to performance class 2 with companies which are regularly audited.
I notice you still haven't responded to SASless's question as to what you regard as being a safe way to do things. Sure, operators in other countries fly clapped out old S76As from pads a few inches above the water. In Nigeria we used to operate Bell 47s, Alouettes, S55s and Wessex. In the fixed wing market they still fly (and crash and kill a lot of people) clapped out old DC9s and 737s. Is that any reason to continue to do so when newer, more powerful and safer aircraft are available?