It is very simple, really, if your site is not enough bandwidth to work with one of two things will happen. The Web site is downloaded peoples monitors very slowly, and probably will not wait. If you say that there is no possibility of buying more bandwidth, it is possible that a small company with poor technology behind them operate shoestring budget. Why only do some companies offer a very limited amount of bandwidth? After spending a lot of time planning the project or the developer of your site who do not want to see a good web site ruined and only several people at once.