except that back during Apollo, NASA consumed between 1.2 and 4.4 percent of the entire annual federal budget. Now it accounts for around 0.5%. So, the pie got a lot bigger, and the space program's slice got a lot thinner. So NASA is actually doing a lot with less. Also - the entire Apollo Program cost around 26b$ in 1969, which works out to about 136b$ in 2007 (and closer to 160b$ in 2017 dollars)
... so it's more like 36% ( 31% in 2017 dollars) of Apollo, and less when you consider that the SLS program didn't even start until 2011, and inflation since then has been around 8.5%. So, yeah, SLS is financially pretty great, compared to the mankind's greatest technological achievement up to the 20th century.