I just arrived into Ft Myers Airport (RSW) ... I paid $64, single person, without tip to get to Marco via Marco taxi.
The high priced monopoly Lee County taxi's are more expense. If you can decipher the below link you are smarter than I ... it looks like you can't take a taxi to Marco ... but if you could it would be AT LEAST $97 without tip.
Here is the link of their high prices: