...When you finally import the wallet you'll be asked for add some gas fee and as soon as you add Tron to the wallet it will be moved automatically to another wallet. ..
I don't think that this kind of fraud can cause even minimal financial damage. If a similar situation happened to you, how much would you deposit TRX for the commission? I am sure that no one would have transferred more than a few cents, since this amount would have been enough to withdraw coins from the wallet.
Imagine if up to 100 or more people fall for this trick per day and they deposit up to 30$ each to move out the tokens, how is that not a big enough? But you are correct for saying that it won't cause a big financial damage for the victims because all they will deposit is just a gas fee, tron is cheaper than Ethereum.