Well honestly 250 would be 1 day of sales of your first shareware
That comment alone is enough to scare me out of taking you seriously. If you seriously think that the average person's first 2d shareware game will earn $250 on the first day, you have much to learn.
You would have to write something seriously special in order to make $250 on day one, not to mention the need for some great marketing.
I think quite frankly you're living in Cloud Cuckoo Land. The Quest3d engine is less than $1000 for the commercial version and has a very impressive 3d engine with shadows, pixel shaders, and very impressive render quality.
I do understand your comment about the amount of work, but unfortunately you can't price things according to the amount of work you put in. You have to be realistic and price according to your competitors.