That cheapo wire is a good investment on their part.
Many people that buy these HtiB systems want it as "plug and play" ready as possible. So, in order to please those they figure why not throw in a few pennies worth of wire in order to please the customers.
Those that care, like yourself, don't mind throwing away twenty cents worth of wire blowing a few bucks on better wire but, by not including it, they may lose some sales to some other, more expensive yet acousticly inferior product that women and architects seem to think is the holy grail of sound because it's so tiny.
And, it's very nice of them to giver you standard connectors that let you use any old wire and not have it all tied together with propriatary connectors and wires like a unnamed, yet very famous more expensive, yet audiably inferior system.
You have a very nice system that sounds much, much better than more expensive systems, particularly the one aleuded to above. Get that wire and enjoy.