Option buying profitable?

Yes. Note that option buying is not a strategy in itself. You need to have an analysis system that will give you the direction of the underlying. Also profitable traders operate within the profitable contours of option buying with respect to time value erosion.

Position sizing is key and this is true.

Several times I have been asked why I keep so much capital idle. I always say the trading capital is not the per trade capital and its the per strategy capital - the capital required to run a strategy for a fair amount of time with enough cushion to absorb the losing streaks, drawdowns etc.

Staying ITM is also important. Going OTM will significantly modify the metrics of the underlying directional strategy.

Unless one has good capital it is nearly impossible to option sell into financial freedom. Option buying allows to do so from a smaller capital base. Also as we scale, liquidity crunch will hit option sellers much faster than option buyers.