If I felt compelled to write anything to educate the customer I probably would have said something like:
"I fully understand your budget situation. It is my hope that you get the cake you want at this much lower price. However, I worry that customers often think price is the only difference between cakes when there is so much more. Since there is such a large disparity in our prices, here are some points I do hope you consider for your peace of mind and confidence in your purchase.
1. I encourage you to research your baker thoroughly and that you feel confident in their skill level. Make sure they have consistent photos of their work and that they have produced cakes with similar quality of design. So often I've seen instances where the reality did not meet the expectations of the cake purchaser. No amount of money saved is worth the disappointment in getting a bad 'bargain'.
2. If you have not tasted the person's cake, order some cupcakes in the flavor and icings that you are wanting and get a taste of their quality. Often bargain bakers rely on cheap ingredients and shortcuts to lessen the cost of their product. Doing this step will assure that you are getting the taste and quality you want for you and your guests.
3. Make certain that there will be no 'hidden' costs that show up later...such as the cost of fondant or gum paste applications, or a filling that was 'extra' or the cost of internal structure (dowels, SPS system, etc.). Make certain your quote is all-inclusive.
If you are satisfied with all the above, then congratulations on finding a true bargain! The costs of quality ingredients, the overhead, and most importantly, the time spent producing a highly skilled design all play into pricing a quality cake. Take advantage of it now because chances are, this baker will eventually have to raise their prices in order to maintain their business if they wish to keep operating with the same high standards.
Best of luck in your purchase and know that if any of the above scenarios do not meet your requirements, I will be happy to provide a quality product that meets and hopefully exceeds your expectations.
Thank you for your consideration!"