Firstly it’s a great honour to selected – to be recognised as the best against your competitors from Wales, Ireland, Scotland, Wales and England. It’s a special tour taking place only once every 4 years so opportunites are rare. The Lions existed before the Rugby World Cup and so has a great tradition. Going “on tour” is something rugby players and supporters always look forward to a special atmosphere. As a player and a supporter you join forces with what are normally your opponents to create a unique atmosphere.
Building a team in such a short period is difficult, hence victories are hard to come by as @thegreatape says above.