On the other hand if your enthusiasm for the idea isn't high enough then you should go ahead and ditch it.
Yeah, well, the most recent thing I dreamed up as some possible money-maker was a numerology app to do the math part for you since I get annoyed by having to do it by hand, only it turns out there are already numerology apps and they have interpretation and stuff. Then I decided I probably didn't really want to do a numerology app, I just had fantasies of making a quick buck because my finances have been very stressful of late. What I really want to do is what I have been working on all along only the "getting well part" that my personal expertise is rooted in is still taking too much effin time/money/effort and continues to delay the "make some cool simulation to teach folks what I did/my mental model so they have some shot at replicating it" part. The actual "getting well" part is critical to doing this because it is what my knowledge is rooted in and it's unique knowledge but, hey, it's really annoying to be sick for 45 years as a means to have a unique product. Bleh.
Then after that I plan on getting rich with a comic.
<everyone laughs>
</flake>
The truth is your not going to come up with a brilliant idea and get rich, so STFU and start building something.
And I am working on stuff, though I am not at the "building something" (as in "writing code") stage. There is other groundwork that is being laid.
Take care.