Define "not at all uncommon." Is 5% of the population enough to earn that label? 15%?
Define "significant savings." $75,000? $150,000?
Last I heard over 20% of those making $100,000 or more annually had no significant savings (less than $10,000) and claimed they lived paycheck to paycheck. Since they constitute only about 12% of the population I'd venture a guess that no more than 5% of the US population has $100,000 or more savings. 5% hardly seems to merit the label "not at all uncommon".
Only about 15% of households have a net worth of $500,000 or more (and it's nearly impossible to imagine having $100,000 in savings if your net worth is less than $500,000) so if were feeling really generous and imagine 1 in 3 of this group have $100,000 in savings we're again left with about 5%.
All this is seats of the pants stuff so maybe someone will come along with hard data and show me that 18% of the US has savings of $100,000 or more and it really is "not at all uncommon" but I'm not holding my breath.
John Thornton