Cryptocurrency markets are highly volatile, with significant and sudden price shifts often influenced by investor sentiment. We demonstrate the significant role of herd behaviour in influencing positive attitudes and subsequent behaviour in cryptocurrency purchasing. Through a survey of 130 active cryptocurrency investors, we empirically examine the factors which influence attitudes and behaviours. Our results indicate that perceived behavioural control, social norms, and propensity to imitate others, a dimension of herd behaviour, strongly influence attitudes towards cryptocurrency behaviour and subsequent behaviours. These findings provide new insights into some of the psychological factors involved in the decision to invest in cryptocurrency and help to understand the unpredictable cryptocurrency market environment.