1: rich is a relative term, but for the sake of argument let’s say it’s if someone has had all of their basic needs met (food, shelter, healthcare), is able to pursue diversion/fulfillment outside of work, and still has enough surplus to hoard without compromising the previous two points.
2: no, it is not possible because as long as there are those who lack adequate food, shelter, or healthcare any surplus wealth should be used to either provide a path for those who are lacking to be able to obtain those necessities themselves or provide those necessities directly (especially in the case of the elderly, infirmed, and/or disabled). To do otherwise would be to deny them of their unalienable rights to life (food, shelter, healthcare) or pursuit of happiness (to live a life worth living).