Would you consider an idea worth pursuing if feedback about interest in the idea is split 50/50?
It depends on how interested are that 50%. If they are eager and ask you about release date then the rest 50% doesn't matter at all.
That's a subjective question.
If you aren't working on anything else, so why not? ¯\(ツ)/¯
If you want to make $$$ then probably not, but if it's just a side project then go for it. Depends on the size of the group you interviewed too. And depends on how much time/effort it would be for you to make
tl;dr it depends 🤷♂️
If you're not 100% on the idea yourself but the positive 50% is willing to put money down, sure.
Though if you're 100% on the idea yourself, who cares?
It depends on the number of people in this 50/50. Usually a product is not for everybody. If you have a niche big enought you can still make a good profit.