I think you meant investing in sleeper buses in a no-brainer. The phrase "no-brainer" is used for decision that do not require thinking twice (Google defines it as "something that requires or involves little or no mental effort.")Investing in Seater buses nowadays is no-brainer. As a loyal Multiaxle fan myself my one-trip in Sleeper recently corrupted my mind. Now I'm slowly bending towards Sleeper buses. Honestly, the comfort in Premium Sleeper Buses is far-high compared to Semi-Sleeper buses
I've personally moved towards Sleepers of late - take semi-sleepers only when the sleepers are too expensive, and when I am traveling alone. I found it hard to sleep when I took sleeper buses initially - but off late, I sleep really well in them.