1973 Bank of Canada $1 solid number notes from '1' to '9'

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True, bulk lots are quite often discounted or a package deal.

A set of solids  isn't quite the same category, in fact they may be regarded as a premium as complete sets are quite a bit scarcer than single notes.

that's quite true, in fact to have a full set definitely is harder than any single note!

Why is this?

Why should I add a premium to buy a set of solid notes?

I've never understood that.  I could understand it if the set had matching prefixes (for example, all notes prefix A/A, which would make it extremely hard to compile), or it was like #1 - #10 in a series (which is hard to find).

I don't see why I should pay more for a set, than if I just bought each note individually and compiled my own set myself.  It's not like sets are rare or hard to get; I see at least 2 solid numbered sets at every coin show I've been to, so I don't see any reason to pay more than each note would be worth individually.

Can someone explain?

Well maybe it would be better stated that no seller would discount a complete set much from the individual price. And to break it up would seem offensive to some.