The values below are approximations based on reasonable assumptions.
Also, feel free to poke holes in my calculations, and if you can provide reasonable evidence to recalculate the values to make them more accurate, I'd gladly update the values appropriately.
In Unpause (S09E15), it is revealed that Barney spends 1 Crapload on suits a year and he makes 16 Craploads a year. Barney also says that Robin's family's wealth amounts to 6000 Canadien Craploads.
In Vesuvirus (S09E19), Barney shows Ted two rooms full of suits. From what is shown, there are 7 racks of 15 suits in one room. Assuming the second room also has 7 racks of 15 suits, Barney owns 210 (2(7*15)) suits.
In Game Night (S01E15), it was stated that Barney has been wearing suits since 1998, which translates to a period of 15 years up to the point of his wedding. Hence it can be concluded that Barney purchases 14 suits a year on average.
In Cupcake (S01E16), Barney takes Marshall to his tailor to get him a suit which was $4000 (which Marshall finds out later on). From this we can calculate that Barney spends $56,000 (14*4000) on suits a year approximately.
In False Positive (S06E12), Barney donates 4 racks of suits, which is a loss of 60 (4*15) suits from the overall collection of suits owned in the span of 15 years.
In Girls Vs Suits (S05E12), Barney accidentally rips a suit which is a loss of 1 suit from his overall collection of suits owned in the span of 15 years.
In No Tomorrow (S03E12), Barney spots a fancy green suit on St. Patty's day.
In The Front Porch (S04E17), it was revealed that Barney sleeps in his specially tailored Suitjamas. Now assuming that he wouldn't bring a flashy green suit and his suitjamas to wear at the wedding, it is safe to assume that these 2 suits weren't in the adjoining room. This adds two more to the overall count.
In Miracles (S03E20), Barney is hit by the bus and later in the hospital reveals to the gang that they had to cut his suit.
In The Naked Man (S04E09), Barney attempts to score with a blonde, who rejects him and kicks him out on the street without his clothes and his phone. Now that adds 2 more suits to the count.
Barney's Yearly Income:
210 + 60 + 1 + 2 + 2= 275 Suits
275 / 15 = 18.333 Suits/year
$4000 * 18.333 = $73,332/year
$73,332 * 16 = $1,173,312
Barney makes $1,173,312 a year.
The Scherbatskys' Wealth:
73,332 * 6000 = 439,992,000
According to the current exchange rate,
C$439,992,000 = US$351,515,557.49
The Scherbatskys have $351,515,557.49.