Often first use data is exclusive for a period of time to the Latest Mailing Database customer it is sold to. Only once that period is up can the business, data specialist or lead generation company sell it as second use data to another company. Often there is Latest Mailing Database no period of exclusivity here.
There is a big emphasis on fresh Latest Mailing Database data - data that is 24 hours old (often generated by lead generation companies through telephone consumer surveys) The fresher the data the more expensive but also in some cases the better the chance of nabbing the customer before somebody else does. So really you get what you pay for and here that's the first pickings of fresh prospective customers.
So if the main advantage of second use Latest Mailing Database data is that it is cheaper what are the main disadvantages? 1. People may have already bought the product you are trying to sell 2. People may complain that they feel harassed - even complain to the authorities e.g. watchdog, the FSA etc. 3. The call centre /telephone sales agents calling Latest Mailing Database the data may get de-motivated calling data that has been 'rinsed', which affects the morale of the whole company, and can mean a high attrition rate.