Its a sim game, it's fun and a great waste of time :)
It has been cheaper before for the single version but I have not seen the entire collection this cheap before ( I could be wrong )
The Blurb:-
Return to the remote island nation of Tropico and expand your Dynasty’s reign from the early colonial period to beyond the 21st Century, facing new challenges including advanced trading mechanics, technology and scientific research, exploration, cooperative and competitive
Complete edition was ~ $10 pre xmas in the sales.
Even now the base game is cheaper elsewhere. Wingamestore 4.99