Why are more companies using team selling? What are its pros and cons?

What will be an ideal response?

Team selling is useful for servicing large, complex accounts. Sales teams can uncover problems, solutions, and sales opportunities that no individual salesperson could. In many cases, the move to team selling mirrors similar changes in customers' buying organizations. Many large customer companies have implemented team-based purchasing, requiring marketers to employ equivalent team-based selling. When dealing with large, complex accounts, one salesperson can't be an expert in everything the customer needs. Instead, selling is done by strategic account teams, quarterbacked by senior account managers or customer business managers.
Team selling does have some pitfalls, however. For example, salespeople are by nature competitive and have often been trained and rewarded for outstanding individual performance. Salespeople who are used to having customers all to themselves may have trouble learning to work with and trust others on a team. In addition, selling teams can confuse or overwhelm customers who are used to working with only one salesperson. Finally, difficulties in evaluating individual contributions to the team selling effort can create some sticky compensation issues.