This question already has an answer here:
A non-profit organization is selling tickets to an event. I suggested they add an opportunity to make a tax-deductible donation line along with the ticket purchase, like:
2 Tickets .... $45
Make a donation!
Your tax deductible donation blah blah
[$10] [$20] [$50]
They liked the idea but insist that the buyer fill in a dollar amount instead of clicking the suggested amounts cause
Its not about what is easy. Its about stewardship of relationships and this is not the place to make a formal "ask". We're simply offering the opportunity in case they have the money or the inclination to donate to us.
I don't understand their point. From a "sales" point of view, I would think being able to just click a button is more enticing while entering a value is just more work on the user's part.