I think it's the freshness TBH. I stayed at at a place for a week with a pub attached that made the best omelettes I've had in my entire life. I complimented them on the food being so good, and they told me they got their food from a market two blocks away.

It was an open air market with stalls and stuff, and the first lady I talked to who was selling eggs and vegetables had a farm a few miles down the road.

Try to get that in USA and it'd probably cost $2 an egg nowadays.