[CommanderData]

Do I need to sign my code which means having to purchase a signing cert? The costs for code signing are prohibitive for some small devs.

[benaadams]

You don't need to buy a signing cert; the Store signs the appx for you for installation. (Though you sign or self-sign the package https://msdn.microsoft.com/en-us/library/windows/desktop/hh4...)

You may need to buy one if you distribute the appx outside the store and you want it to be automatically trusted? (As you don't need to distribute the appx via the Store or install via the Store)

[huhtenberg]

Unless it's some sort of weekend hobby project, ~$100 a year is hardly "prohibitive".

[1] https://www.digicert.com/friends/sysdev/