Plot hole?

You must have missed a good chunk of the exhange. He said they used to find women from Eastern Europe and bring them over on promise as nannies or housekeepers and then they'd drug them and sell them, but they started just kidnapping vacationers because it saved on the transportation costs (from eastern Europe to France).

The way I saw it was that girls travelling from, say, America to France might be more naive/excited/culture shocked. So having a suave foreign guy approach them and call them princess would work wonders to drop their defenses. I'm not saying EU girls are smarter or anything, but they might be less awestruck by, say, a French accent, than an American girl who has never left the States would be. Therefore it would just be easier to get them to go along with you or invite you in or whatever. In other words American girls are easily wooed by foreign guys.

They used to bring girls from Europe to America and then turn them into prostitutes. But that was pricey, because of having to pay to transport them from Europe to America. So they started kidnapping vacationing girls IN Europe. And you are right that Western families have more money, but the kidnappers have no intentions of ransoming them. Doing a ransom is tricky and might lead to them getting caught. They strictly deal in taking girls and using them as prostitutes. So that's why its cheaper to kidnap travelers, because you don't have to pay transportation fees.

they had to have american girls for this movie, because people relate less to -more realistic- rumanian girls, care less. I hate that it is this way, but its reality.

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Despite the "explanation" in the movie, your criticism is valid. Prostitution, like any other business, tries to manage risk.
There is a huge supply of attractive and reasonably educated girls and women from Eastern Europe who are low cost resources for the scum that manage them. Some are convinced to come here with the old tactic of a job promise, and then the standard prostitute- making brutality, but many of the girls that we see here in Europe are tech savvy, city women who know exactly what they are getting into when they come to western Europe.
I can only imagine how hopeless life must be in Romania or Belarus that standing on the street on an Italian ring road waiting for an unwashed truck driver is a better alternative, but life in the former soviet bloc is tough. I feel for these girls.
Here in my part of Italy, it is mostly Romanian gangs that "manage" the girls. They had a little territorial shoot out the other night, and the town fathers cracked down on them and put them out of business for a month.
Adding influential and wealthy fathers to the mix of risks wouldn't make for good business, and this part of the movie, as well as many other parts, didn't ring true.

Not a plot hole. Even if your point is valid, it doesn't in any way affect the plot beyond those few words.
You're so stupid it's almost physically painful. Stop your damn trolling.

Don't know if this has been asked before, but when Bryan tries to identify the traffickers at the time he's still in America, Bryan's friend/ex-partner whatever says someting like...