There's a really good chance that the speed of light is the universal speed limit. If that's the case, then interstellar travel isn't going to be worth it for resources because the time and energy it takes to do it will almost certainly eclipse what you're going to gain from the trip. Especially if that trip is going to take thousands/millions of years.
The reality is that if you have the energy and resources to move a significant population to another star system, you're going to have to solve permanent space habitation; and if you did that, why the hell do you need to go anywhere?
"Shits and giggles" just doesn't seem like much of a reason to load the next 300 generations of your family into an interstellar RV.