Reasonable (for the buyer): you like the price.
Reasonable (for the seller): completely pays off all R&D time, molds, destructive testing, CNC programs, ads, distributor network requirements, etc. and gives a good ROI (25% annual?).
Even this assumes no failures, delays, strikes, embargoes, recalls.
My dad used to say "Want to sell light bulbs? The first one is $10 million, the 10 millionth one is $1.".

If they can only sell 10 - they won't (doesn't begin to pay for the start-up costs).
If they can only sell 100 they will be $6,000 - and they won't (no buyers).
If they sell 1,000 they will be $1,999 - and they won't (900 will still be on the shelf in a year).

See the problem? There isn't enough volume to permit a low price, and no buyers at all if it's not.