It depends on how rich or how famous one wants to be? A frum Jew would never end up giving away a much higher percentage of his wealth than even someone like Bloomie or Gates (both of whom give large amounts of money). To sit on that much money would be unacceptable in the frum world.
Getting that rich might be a problem as well, since its unlikely a yid with beard and pe’os and keeping Shabbos and kashrus could have pulled it off.