Another problem with laying tiles directly into concrete:
moisture from the concrete seeps through the grouts and overtime, it might grow moldy.
Another concern: heating costs. Tiles will absorb the cold from the slab underneath and it takes a lot of heat to bring them to comfortable temperatures. I'd go for a flooring solution that is specifically made for basements.
- They are modular, so that you can take a piece out to fix a crack on the slab or replace a tile if it gets damaged just as you'd do with a tile carpet.
-They act as a vapor barrier so you do not need to install one underneath. And there are a number of studies about the energy savings they allow.
-They won't rot, grow mold, absorb moisture and, save an eventual tile replacement in heavy traffic areas, you will never have to rip it all out.
Unless you want to go for another overall look.
-They can be used (you can walk and place furniture on) immediately after installation.