You're comparing apples with oranges.
Blackpool is a place to go and have fun - Lytham St Annes is somewhere to go to play golf. Suitable for southerners who don't know how to let their hair down.
Think you may have that the wrong way round!
Twice as many visitors to Blackpool as go to Brighton - great funfair, sandy beaches, three piers, circus, international ballroom, etc. all with a population of half that of Brighton.
I enjoy visiting Blackpool in the summer.