What will be your cost (materials, supplies, labor, wear/tear on equipment, utilities, etc.)?
Where are you located. What hourly wage + benefits do you pay your employees?
Your totals for all of this will be different than mine or someone else. Someone who gives you a number will, in all likelihood, be either too high or too low based on your individual circumstances.
99/100x this will end one of two ways... you'll never hear from them again because you're being price shopped; or they'll go with 2,500 but aggravate you to death to give them the 10,000 price with promises of doing 7,500 more at a later date (which will never happen).
Every time someone asks me for a ridiculous quote like that I ask them what will determine whether they do 2500 or 10,000 and if their answer isn't solid I blow them off.
99/100x this will end one of two ways... you'll never hear from them again because you're being price shopped; or they'll go with 2,500 but aggravate you to death to give them the 10,000 price with promises of doing 7,500 more at a later date (which will never happen).
Every time someone asks me for a ridiculous quote like that I ask them what will determine whether they do 2500 or 10,000 and if their answer isn't solid I blow them off.
I agree with Rick and Lucy. I think they will most likely be price shoppers or try to get you to give them the higher volume price for the lower quantity. I always tell my customers that my prices are non negotiable for my protection and theirs. I explain I need to make a profit to stay in business and prices are set in stone so all customers are assured they pay the same price. I take all quote serious and would never ignore a potential customer. I nevr do work on a promise of getting a bigger order later on. I encourage you to take a strong stance and never negotiate on your price. This will save you many issues in the future. If you negotiate a price today, they will expect it every time. .... JB
How to price a large job? 
all that you posted is so true.
