Odd options on Option chain not being liquid

Can anyone let me know why “Odd options” like the ones ending with 50…(850, 950, 1050 etc) are not as liquid as options ending with an even number on the option chain ?

Liquidity brings liquidity.

50 strikes are not liquid -> less people trade it -> 50 strikes are even more not liquid
100 strikes are liquid -> more people trade it -> 100 strikes are even more liquid