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If I license my project with MIT-license, could someone:
Help > About dialog box, as required by "The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software."Yes, they can.
If someone displays the original license in a dialog box as you described, they have fulfilled the requirements of the MIT license. Therefore they can also enjoy all the rights granted by it (one of which is to sell the software).
If you don't want that, you can use a copyleft license like the GPL. Those licenses still grant the rights to sell the software, but they have additional requirements which guarantee that the software remains open-source.
