The other countries don't get our commentary, they'll have their own commentator, so they don't know if Graham or whoever is taking the Mickey.
The winning entries will not only have been played on the radio in neighbouring countries, but they tour and promote the songs. We don't have the same overlap of popular culture as some of the winners.
It'll be harder to get an established act to represent UK as some will be concerned the reputational damage of doing badly.
I have fun wondering who we'd send from Scotland if we got independence and whether we'd do better. Think we'd do better.