It seems awfully excessive considering the multiple 30 AMP and 15 AMP runs would not be needed. The incremental cost here is larger wire (#4-#2 copper depending on what chart you use vs whatever would be needed for the other circuits (BTW #2 is $ .95 a foot so that is only $15.00 for the largest wire)) and the cost of the 100 AMP feeder breaker (about $35.00). It was also mentioned that larger conduit would be needed and that is harder to work with the larger wire.

I am not so sure about how hard it is to deal with #2 copper. I just rewired my main panel with 4/0 aluminum and that is tough stuff to work with!
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