Working against successfully passing yourself off as a Lusitania survivor, at this point, is that there are very few survivors you COULD be. Of those between infant and age 10 (who could CONCEIVABLY still be alive) all but one or two are proveably dead at this point. SO, you'd have to pick a survivor that NONE of the researchers out there have found (and how would you know who that was?) and learn enough about that person to be convincing.
Twenty-five years ago, your best bet to pass yourself off as a survivor would have been to select one of the third class passengers who was returning home to Persia (Iran)or Russia (U.S.S.R.), neither location being conducive to follow-up research. However, none of those passengers could possibly still be living, so that fraudulent boat has sailed, so to speak.
But, there are a number of fraudulent historical figures out there. Reporters doing "Anniversary" stories, aka History Lite Puff Pieces, have neither the time nor inclination to do the kind of digging needed to prove or disprove a person's claims~ the number of "children' who now claim to have seen the assasination attempt of Roosevelt (at which Mayor Cermak of Chicago WAS killed)is now so large that it suggests Roosevelt was fired upon during a visit to Children's Village, but in the end a quote from an old person who PROBABLY was not there does not really hurt anything.
Where it DOES hurt is on the occasions when the fraud goes deeper than a puff piece printed on an anniversary. Taking money from novice researchers, lazy documentarians, and young history buffs whoa re not yet jaded is fraud, no matter how one looks at it, and no matter how minor the sums involved are.