First of all, i am a turkish guy with both american and turkish passport and i know both natioas very well.. just like there are peopel from turkey whom i dont like, there are some in usa too. However, when i compare to the ignorance of americans, it is really incredible.
First of all, incirlik air base is a place for military, not a tourist area.. Turkey do not need the money of a couple of American families who will spend maximum 10 thousand dollar in a month.
Secondly, 15 Turkish soldiers were shot down to death in 2 weeks, Cnn-Turk And Haber-Turk Tv channel has tarted a campaign and more than 120 million dollar was collected as aid to the families of the soldiers , as u can see thats the problem of the whole nation, we are exteremely patriotic people who will defend their country wthout hesitating to sacrifice their lifes. USa cannot nuke turkey, turkey holds chemical and nuclear weapons too, pls stop being such an idiot american. ( I dont mean all americans are idiots, pls dont get me wrong)
Now i will try to answer your question. Incirlik and the Other base in turekey are the most advanced and important bases of USA. I am here in Turkey right now and the government is just closely wtaching following action of USa parlements regarding Genocide Myth of 1915. So shutting down the bases is directly connected to this issue.. it is not about the invasion.
Turkey will have an incursion to North IRaq soon and they will extend their boarders 45 KM deeper inside. The main reason to do is to pass over mountains so there will be open plateaus where terrorist cannot find a spot to get in Turkey.
USa , of course wont like that idea but it has no got another choice. Interests of both nations are in questions and Turks are not bluffing ( just remember 1974 Cyprus invasion of Turkey , Operation Atilla). When Turks entered north iraq, american troops will press the terrorist from south and turkish troops from north and they will eliminate them. if usa troops dont do such things (0.5 % possibility) , turkish and american soldiers will encounter and God knows what happens.
yes u need those bases. if we shut down your those bases , u will loose all your control in iraq , plus your planes wont be able to fly over turkish air space.
you can read here
http://edition.cnn.com/2007/WORLD/meast/10/10/turkey.kurds.ap/index.html
U.S. President George W. Bush strongly urged Congress to reject the bill, saying it would do "great harm" to U.S.-Turkish relations. Defense Secretary Robert Gates said that 70 percent of U.S. air cargo headed for Iraq goes through Turkish air space. About a third of the fuel used by the U.S. military in Iraq also goes through Turkey.
"Access to airfields and to the roads and so on in Turkey would very much be put at risk if this resolution passes and Turkey reacts as strongly as we believe they will," Gates said.