Any question answered...

It may well be worth going for it then, I reckon you'll be looking after either chain properly and might get the extra benefit from the better one if it's testing at lasting thatb much longer. For most people the main issue will be either ignoring the chain, washing the shit out of it or smashing lube on dirt on lube, all of which will be better off with a new cheap chain before they have the chance to fuck up the old one too much. If you're giving it a quick and often surface clean and light lube or spending way more time than it's worth fucking about with sonic cleaners and pfte infused wax, then a better chain makes sense so have at it. I've got an XTR/Dura ace chain currently but it was on trade offer less than most cheap ones so why not? Not fucking it up from the extremes of too little or too much misplaced care are probably bigger factors than the actual chain choice as long as it's not actual shit.