Would you buy a PC that you could not upgrade ?......................most people would say no.
Its the same principal for investing in a quality website, they should be designed in a way that allows for easy, low cost upgrading in the future. To ensure this, your code must be 'clean', accurate and adhering to Industry bench marks ( w3c). It is similiar to the building of a house, without a solid foundation, your building will collapse eventually.
Your objective when purchasing a website should be to look at it as a ongoing project, which can be tweaked and changed as your business changes in direction, markets and goals. My aim is to provide you with a valuable business tool to increase your sales and decrease your costs. The Internet is the medium to achieve this Goal.