i feel, it is worth risking 5.5 rs to make 5.5 (only if my trading strategy produce more than 60% success rate).
There are people (including me) who will pass the trade if RRR is not > 1. That is because even if system has win% of 60%, probability of next trade to hit target or stop is always 50:50. It is conditional probablity (coming out from system design as win%) that could be 60%. So in my trading, whenever I take a trade, I use probability of that trade as 50% and hence I look for RRR > 1. Maybe I am conservative in taking risk in trading.
Anyway, it is matter of personal preference.
Happy Trading.