One of the coolest things about Batman is that he does not possess any superpowers. Sure, Bruce Wayne might have genius-level intellect, unbelievable fighting skills and a ton of money, but at the end of the day, technically, there is nothing that could prevent you from becoming someone like him.
Oh, actually there is one thing (among others) - money (being a billionaire definitely helps)! So, here is how much it would actually cost to become Batman:
High-quality protection certainly doesn't come cheap. This is especially relevant, in this case as a custom graphite cowl costs much more than all of the other elements of the Batsuit combined.
The gadgets and weaponry
What kind of a Caped Crusader would you be without a lot of high-tech gadgets and weaponry? Now, of course Bruce Wayne is definitely fortunate to be the owner of Wayne Enterprises, so probably these items would be cheaper and easier for him to obtain.
Bruce Wayne was not born a fighting master and a polymath. Here is how much it would actually cost to obtain the qualifications to get you on par with the skills that he possesses.
The residence and (your own) Alfred
What kind of a Batman would you be if you don't have your own mansion (and a cool and caring butler)?