They really have no business being collected for the hobby. Unless you eventually plan to upgrade to a tank in the 1,000s of gallons range you won't be able to accommodate one as it grows. Although it takes over a decade, even if fed properly, these guys get to well over a foot. Besides just being big they need lots of open sand to forage for the worms and mollusks they eat. It takes a lot of room to keep a sustainable population of their food, plus these guys actually have to keep walking in order to eat their food once they find it. They're also from cool to temperate temperatures, not constant temps like those found in a reef tank.
The typical life of one of these guys in a reef tank is something like this: You add one that's a few inches long. It swims around the tank, knocking things over for a little while and then buries in the sand. At that point you rarely see them again.