It’s obvious, if you never try anything, you’ll never learn. Failure is part of learning.
It should be expected.
However, in Silicons Valley’s startup culture failing seem to have become chic. A prerequisite to success. I don’t think failure should be idealized or in the eyes of an investor be marginalized.
If you are learning to surf and fall off the board constantly that is your thing, but if someone gives you money because he/she believes in your idea, you better not fail.
This is not business school; this is real life. And as such, there may in reality not be too much learned from a failure. For there is mostly never only one clear reason for the failure. There is usually multiple reasons. You may think it was the price, but in reality, it was the bad performance of the support forum and problems with the payment processor.
So you fiddle with the price the next time and fail again. Failure can’t always be avoided, but at least try. (Because try you must).