For example, being slapped with an unforeseen cost of selling an item making the money earned less enjoyable.
An expression for the unexpected cost raining on my parade, or for being too optimistic that I had overlooked those costs.
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Your enjoyable moment proved to be a chimera
a hope or dream that is very unlikely ever to come true
A chimera is an unrealistic idea that you have about something or a hope that you have that is unlikely to be fulfilled
an illusion or fabrication of the mind especially : an unrealizable dream