Four in 10 gamblers have never actually set foot in a casino, according to research.
Nearly a quarter (23 per cent) of those who flutter online worry about getting it wrong in person, and 22 per cent fret about looking out of place.
Others worried about having to travel there or not having anyone to go with (both 20 per cent).
Of those who have been to a casino, 15 per cent have only done this once or twice.
A spokesperson for Online Betting Guide, which commissioned the research of 1,000 adults as part of its gambling report, said: “Habits are changing all the time.