People spend up to _% more price for the same product with better Service.

I THINK FOR BETTER SERVICE PEOPLE CAN SPEND FROM 5% TO 10 % NOT MORE BECAUSE SERVICE IS IMPORTANT BUT NOT AS THE PRICE AND QUALITY

i think from 10 to 25 %                            .

It is only up to 10% and not more. 

I agree with Mr Adel answers .............................

 I leave the answer to the experts  specialists in this field 

I think not more than 30%<<<<<<<<<<<<<<<<<<,

I agree with Mr Adel answers, thanks for the invitation. ..

Thanks

I agree with the answer given by colleague Adel