Nah - bloody audiophiles and their expensive posh looking connectors
All you need are these really, as long as you don't push and pull 'em about all the time -
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These below have increased in price these last few years, but make good surface contact to the socket regardless.
Banana Plug Speaker Connectors. 4 x Gold Plated BFA-Z 4mm. Highlands and islands will be more expensive.
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Other trad springy contact types available and seem to work just fine
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As for bare wire and/or spades, I've seen spades easily work loose and for a typical lay enthusiast forum bod, a single loose strand is all it takes to short the amp's speaker terminals..