Does it make sense to upgrade to a 64-bit version for a "typical" Mac OS X application?

Question

I understand the main advantages of creating a 64-bit application on Mac OS X: more available memory, better performance, etc.

But what if I have an application with modest memory needs and no performance issues. Suppose porting it to 64-bit is just a matter of changing build settings. Will accessing a 64-bit executable provide real benefits to my users on Leopard or Snow Leopard?

I know that the reaction of many programmers on the knee is “Of course you must support 64-bit!”, And some experienced users will mock and complain if they see that your application is not 64-bit, but I’m interested in the real benefits / costs .

Some related issues:

• I could provide a combined universal 32-bit and 64-bit application, but will the benefits (if any) justify the larger download size?
• I could provide separate 32-bit and 64-bit downloads, but would that just confuse users?

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